Many established Swahili nouns replace a verb’s final vowel with -o and add a noun-class prefix. The result may denote an implement, material result, event, product, or conventional outcome: kifuniko “lid,” jengo “building,” mchezo “game,” and matokeo “results.”
The visible relationship is useful, but -o is not a productive English-style suffix that guarantees a word. Noun class varies, plural formation varies, and meanings often narrow. Learn mchezo/michezo, jengo/majengo, and kifuniko/vifuniko as complete lexical pairs rather than outputs of one automatic formula.
Final-vowel replacement
For a regular verb ending in -a, classroom analysis can replace that final vowel with nominal -o after the root or an extended verbal theme:
| Related verb | Analytic build | Noun | Established meaning |
|---|---|---|---|
| kucheza | m-chez-o | mchezo | game, match, play |
| kupanga | m-pang-o | mpango | plan, arrangement |
| kushona | m-shon-o | mshono | seam, stitch, style of sewing |
| kujenga | jeng-o | jengo | building, built structure |
| kufunika | ki-funik-o | kifuniko | cover, lid |
| kutokea | ma-toke-o | matokeo | result, outcome, results |
The ordinary words are written without hyphens. The derivation replaces the verbal final vowel; forms such as mchezao wrongly keep -a and then add -o. In matokeo, the relevant base includes material from kutokea, so the word is not simply ma- + tok + -o.
Mpango wa ukarabati umebadilika baada ya mafundi kukagua paa.
The renovation plan changed after the tradespeople inspected the roof.
Kifuniko cha chupa kimeanguka chini ya jokofu.
The bottle cap has fallen under the refrigerator.
Implements and results are related, not identical
Historically and semantically, -o formations often identify what carries out an action or what remains after it. Modern vocabulary does not keep that split perfectly clean.
| Profile | Examples | What is lexicalized |
|---|---|---|
| implement or associated object | kizibo, kifuniko | cork/stopper; lid/cover |
| material result | jengo, mshono | built structure; seam/stitch |
| planned or organized outcome | mpango | plan or arrangement |
| event or performance | mchezo, wimbo | game/play; song |
| collective outcome | matokeo | result(s), outcome |
Mshono wa begi hili umeachia, kwa hiyo nitalipeleka kwa fundi kesho.
The seam of this bag has come loose, so I will take it to a repairer tomorrow.
Matokeo ya uchunguzi yameonyesha kuwa maji hayo ni salama kunywa.
The test results have shown that the water is safe to drink.
Matokeo can translate singular “outcome” or plural “results,” but it always controls class-6 ya- agreement. Mshono is class 3 and controls u-. Semantic label “result” does not assign one noun class.
The nominalizer can follow an extended theme
The base of nominalization is not always the shortest root. An applicative, causative, or other historically extended theme may appear before -o, and the complete derivative can then lexicalize.
| Related form | Nominal | Established result |
|---|---|---|
| kutokea “occur, emerge” | matokeo | outcome, result(s) |
| kukumbusha “remind” | ukumbusho | reminder, commemoration, memorial |
| kulisha “feed” | malisho | pasture, fodder, grazing |
Ukumbusho huu uliwekwa hapa ili vizazi vijavyo vikumbuke tukio hilo.
This memorial was placed here so that future generations would remember that event.
Malisho ya mifugo yamekauka mapema mwaka huu kwa sababu ya ukame.
The livestock pasture has dried early this year because of the drought.
The related verb helps explain the semantic family, but modern ukumbusho and malisho have their own noun-class behavior and lexical senses. Removing what looks like an extension or replacing it with a different one does not guarantee another accepted noun.
Noun class and plural are part of the derivative
| Noun | Class pair | Plural | Agreement frame |
|---|---|---|---|
| mchezo | 3/4 | michezo | mchezo huu ume- / michezo hii ime- |
| mpango | 3/4 | mipango | mpango huu ume- / mipango hii ime- |
| jengo | 5/6 | majengo | jengo hili lime- / majengo haya yame- |
| kifuniko | 7/8 | vifuniko | kifuniko hiki kime- / vifuniko hivi vime- |
| wimbo | 11/10 | nyimbo | wimbo huu ume- / nyimbo hizi zime- |
| matokeo | 6 | normally plural-form/collective | matokeo haya yame- |
Mchezo huu wa kirafiki umeahirishwa, lakini michezo ya ligi itaendelea.
This friendly match has been postponed, but the league matches will continue.
Jengo hili la zamani limefungwa, na majengo mawili mapya yatafunguliwa Jumatatu.
This old building has been closed, and two new buildings will be opened on Monday.
The ending -o does not determine number. Classes 3/4, 5/6, 7/8, and 11/10 contribute their own prefix alternations and concord. Some nouns, especially class-6 collectives, have no ordinary singular partner in the intended sense.
One root: event, agent, process, and result
The -jeng- family shows how different nominalizations select different parts of one building event.
| Form | Category/class | Valency | Meaning |
|---|---|---|---|
| kujenga | transitive verb / class 15 | builder subject + thing built object | build; building something |
| mjenzi / wajenzi | human classes 1/2 | lexicalizes the builder participant | builder(s) |
| ujenzi | class 14 | backgrounds participants | construction process or industry |
| jengo / majengo | classes 5/6 | lexicalizes the completed product | building(s) |
| kujengwa | passive verb | thing built becomes subject | be built |
Wajenzi wanajenga zahanati mpya karibu na stendi ya mabasi.
The builders are constructing a new clinic near the bus station.
Ujenzi wa zahanati umechelewa, lakini jengo lenyewe halijapata uharibifu.
Construction of the clinic has been delayed, but the building itself has not been damaged.
Finite wa-na-jeng-a retains builders, object, and present time. Class-14 ujenzi names the process; class-5 jengo names the product. English building can cover both, so direct translation hides the lexical choice.
Lexical specialization and historical residue
The connection to the source verb may remain recognizable while the noun develops a narrower sense. Mwendo means movement, pace, gait, or course—not every occurrence of “going.” Mpango is a plan or organized arrangement, not every act of placing things. Wimbo means a song, while kuimba names singing.
Daktari aliniuliza kama mwendo wangu umebadilika tangu nilipoanguka.
The doctor asked whether my gait had changed since I fell.
Wimbo huo mpya ulitungwa kwa ajili ya tamasha la shule.
That new song was composed for the school festival.
The surface shapes of mwendo and wimbo preserve adjustments beyond a simple modern prefix-plus-root calculation. This is historical residue: analysis explains relationships, but speakers store ordinary words as lexical items.
A quick action–process–result test
If the phrase can keep a direct object and manner expression, the class-15 infinitive is usually the productive choice. If it names a recognized domain or ongoing process, a lexical class-14 noun may fit. If it identifies a resulting object or established event type, an -o noun may fit.
Kushona sare hizi kwa mkono kutachukua siku tatu.
Sewing these uniforms by hand will take three days.
Mshono wa sare ya kwanza haujanyooka, hivyo fundi ataufumua na kuushona tena.
The seam of the first uniform is not straight, so the tailor will unpick it and sew it again.
The first phrase foregrounds the action, its object, and method. The second names a concrete result of sewing. English sewing can refer to either; Swahili makes the lexical choice more explicit.
Register and neighboring constructions
Common nouns such as mchezo, mpango, jengo, kifuniko, and wimbo are neutral in (informal) and (formal) Standard Swahili. Abstract matokeo is equally ordinary in education, journalism, and research. Specialized technical -o nouns should be verified rather than coined.
Use a class-15 infinitive to name an action with its object, a class-14 noun for a conventional process, and a lexical -o noun for its established implement or result. See productive ku- nominals for the productive alternative.
Common Mistakes
Keeping verbal -a before nominal -o
❌ Mchezao wa leo umeahirishwa kwa sababu ya mvua.
Incorrect — the established noun is mchezo, with final -a replaced by -o.
✅ Mchezo wa leo umeahirishwa kwa sababu ya mvua kubwa.
Today's match has been postponed because of heavy rain.
Giving every -o noun the same plural
❌ Jengo hizi mbili zitafunguliwa mwezi ujao.
Incorrect — a quantity of two requires plural majengo with class-6 agreement.
✅ Majengo haya mawili yatafunguliwa mwezi ujao.
These two buildings will open next month.
Choosing agreement from the ending
❌ Kifuniko hili limepasuka baada ya kuanguka.
Incorrect — kifuniko is class 7 and requires hiki and ki-.
✅ Kifuniko hiki kimepasuka baada ya kuanguka.
This lid cracked after falling.
Treating a related noun as a compositional synonym
❌ Mwendo mpya wa ofisi umejengwa karibu na soko.
Incorrect for ‘a new office building’ — mwendo means movement, pace, or gait.
✅ Jengo jipya la ofisi limejengwa karibu na soko.
A new office building has been built near the market.
Key Takeaways
- Established -o nominalizations often replace a verb’s final vowel and name an implement, event, or result.
- The derived noun’s class, plural, agreement, and exact sense are lexical facts.
- Related forms can foreground action, agent, process, or product: kujenga, mjenzi, ujenzi, jengo.
- Historical sound changes and semantic specialization make unrestricted coinage unreliable.
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Start learning Swahili →Related Topics
- Deverbal and Event Nouns in Class 6B2 — Understand class-6 ma- nouns for actions, results, and collective events, including forms that are grammatically plural but singular or mass-like in English.
- The Infinitive as a Class-15 NounB1 — Use ku- infinitives as subjects, objects, and predicate expressions, with class-15 agreement and English gerund translations.
- Deverbal Nouns and Event NominalsB2 — Turn actions into class 15 infinitives, agent nouns, and lexical event or result nouns without losing noun-class agreement.
- Instrument and Result Nouns in Classes 7/8B2 — Recognize productive ki-/vi- nouns for tools and products without treating the pattern as a mechanical word generator.
- Deriving Causative and Stative Verb PairsB2 — Relate causative -ish-/-esh- and stative -ik-/-ek- verbs through their form, valency, lexical meaning, and productive limits.