If you learn only one Turkish derivational suffix, make it -CI. It is the engine behind a vast share of the words for jobs, trades, sellers, and enthusiasts, and it is so productive that Turks coin new -CI words on the fly. Attach it to a noun and you get the person who deals in that thing: gazete ("newspaper") → gazeteci ("journalist"), futbol → futbolcu ("footballer"), yol ("road") → yolcu ("passenger, traveller"). The catch is the spelling: -CI changes its vowel four ways and its first consonant two ways, and getting that right is what separates a learner from a near-native.
What -CI means
The core meaning is "the person associated with X" — but that umbrella covers several everyday senses.
Profession or trade: the person whose work is X.
Babası emekli olmadan önce gazeteciydi.
His father was a journalist before he retired.
Seller or maker: the person who sells or produces X.
Akşam üstü balıkçıdan iki tane levrek aldık.
In the late afternoon we bought two sea bass from the fishmonger.
Köşedeki simitçi sabahın altısında tezgâhını açıyor.
The simit-seller on the corner opens his stall at six in the morning.
Enthusiast or "a person who is into X": the fan, the habitual doer.
Amcam tam bir sanatçı ruhlu, hayatını resme adamış.
My uncle has a real artist's soul — he's devoted his life to painting.
The one characterized by X (often negative): a person defined by a trait or vice.
Ona güvenme, resmen yalancının teki.
Don't trust him — he's a downright liar.
So yalan ("lie") → yalancı ("liar"), iş ("work") → işçi ("worker, labourer"), kapı ("door") → kapıcı ("doorman, building caretaker"), çay ("tea") → çaycı ("tea-server"). One suffix, an entire lexicon of people.
The four-way vowel harmony
-CI has a high vowel, so it harmonizes both for front/back and for rounding. That gives four shapes:
| Last stem vowel | Suffix vowel | Example |
|---|---|---|
| a, ı | ı | yalan → yalancı |
| e, i | i | iş → işçi |
| o, u | u | yol → yolcu |
| ö, ü | ü | göz → gözcü |
Sınırda nöbet tutan gözcüler bütün gece uyumadı.
The lookouts keeping watch at the border didn't sleep all night.
The hardening: -çI after a voiceless consonant
Here is the part learners miss. The first consonant of -CI is a "soft" c by default, but it hardens to ç when the stem ends in a voiceless consonant. The voiceless consonants are easy to remember with the mnemonic fıstıkçı şahap — the letters f, s, t, k, ç, ş, h, p (plus their relatives). After any of these, c → ç.
| Stem ends in… | Suffix | Example | Gloss |
|---|---|---|---|
| voiced sound (vowel, l, n, r, m, b, d, g, z…) | -cI | yol → yolcu | passenger |
| voiceless (f s t k ç ş h p…) | -çI | kitap → kitapçı | bookseller |
So kitap ends in voiceless p → kitap*çı (never *kitapcı); balık ends in voiceless k → *balıkçı; *simit ends in voiceless t → *simitçi; *iş ends in voiceless ş → *işçi. But *yol ends in voiced l → *yolcu with a soft *c, and oyun ("game") ends in voiced n → *oyuncu* ("player, actor").
Mahalledeki kitapçı eski baskı kitaplar da satıyor.
The bookshop in the neighbourhood sells old editions too.
Takımın yeni oyuncusu daha on dokuz yaşında.
The team's new player is only nineteen.
This is the same voicing logic behind the d-to-t and devoicing changes: the suffix simply agrees in voicing with the sound before it. The huge advantage for you is that the spelling reveals the stem's final voicing — if you see -çı, the stem ended voiceless; if -cu, it ended voiced.
When the stem changes too
If the stem itself ends in a softening consonant, watch both ends. Ekmek ("bread") ends in voiceless k, so the suffix hardens to -çi — but because -CI begins with a consonant, the stem's final k does not soften (softening only happens before a vowel). The result is ekmek*çi* ("baker, bread-seller"), clean on both sides.
Sabah taze ekmek için ekmekçiye uğradım.
In the morning I stopped by the baker's for fresh bread.
Düğünde fotoğrafçı yüzlerce kare çekti.
The photographer took hundreds of shots at the wedding.
Note fotoğrafçı: stem ends in voiceless f → harden to -çı. Once you internalize the fıstıkçı şahap set, these become automatic.
A productive engine you can use
Because -CI is so productive, you can attach it to loanwords, brand-new concepts, and even compounds, and a Turkish speaker will understand you. Bilgisayar ("computer") → bilgisayarcı ("computer guy, IT person/seller"); internet → internetçi. This is also where the trait sense lives in slang — takıntı ("obsession") → takıntılı uses a different suffix, but kavga ("fight") → kavgacı ("quarrelsome") shows -CI generating a personality adjective/noun.
Şu inatçı çocukla baş etmek kolay değil.
It's not easy to deal with that stubborn kid.
Here inat ("obstinacy") → inatçı ("stubborn") — voiceless t triggers the -çı form, and the word works as both noun ("a stubborn person") and adjective ("stubborn").
Common mistakes
❌ kitapcı
Incorrect — no hardening after the voiceless p.
✅ kitapçı
bookseller / bookshop.
This is the single most common -CI error for English speakers. Voiceless p forces c → ç.
❌ yolçu
Incorrect — over-hardening after the voiced l.
✅ yolcu
passenger, traveller.
The flip side: don't harden after voiced sounds. Yol ends in l, which is voiced, so the soft c stays.
❌ balıkcı
Incorrect — failing to harden after voiceless k.
✅ balıkçı
fishmonger.
Balık ends in voiceless k → -çı. (And note k does not soften to ğ here, because the suffix starts with a consonant.)
❌ futbolci
Incorrect — vowel harmony violated; after o the vowel must be rounded u.
✅ futbolcu
footballer.
The last stem vowel o demands a rounded back vowel, so it's -cu, not -ci.
❌ gözci
Incorrect — after ö the suffix needs the rounded front vowel ü.
✅ gözcü
lookout, scout.
Front and rounded: ö pulls the suffix to -cü.
Key takeaways
- -CI makes "the person who deals in / is into / is characterized by X" — professions, sellers, fans, and trait-nouns alike.
- It harmonizes four ways: -cı / -ci / -cu / -cü.
- It hardens to -çı / -çi / -çu / -çü after a voiceless consonant (the fıstıkçı şahap set: f s t k ç ş h p…): kitapçı, balıkçı, simitçi, işçi.
- It stays soft -cI after voiced sounds: yolcu, oyuncu, gözcü.
- The spelling is diagnostic — -çı means the stem ended voiceless, -cu means it ended voiced.
Now practice Turkish
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Start learning Turkish→Related Topics
- How Turkish Builds WordsB1 — Turkish grows long words by stacking meaning-bearing derivational suffixes onto a small set of roots — göz → gözlük → gözlükçü → gözlükçülük — so learning the suffixes turns vocabulary into a system you can decode and even coin yourself.
- Suffix Hardening: the D and C ArchiphonemesA2 — The mirror image of softening — a suffix-initial D hardens to t and a suffix-initial C hardens to ç after a voiceless stem, so the locative is kitapta (not *kitapde) and the past is gitti (not *gitdi).
- Forming Abstract Nouns with -lIkB1 — One workhorse suffix builds abstract nouns ('-ness', '-hood', '-ship') and concrete 'thing-for' nouns alike — güzellik, çocukluk, gözlük, tuzluk.
- Having and Lacking: -lI and -sIzA2 — The antonym pair -lI ('with / having / -y / -ful') and -sIz ('without / -less') turns almost any noun into a matched pair of adjectives — şekerli/şekersiz, anlamlı/anlamsız — so one suffix pair generates a whole field of describing words.