Compound Nouns

Greek is a heavy compounder. Where English strings two separate words together and leaves a space — windmill is one of the rare fused ones, but bus stop, olive oil, tooth brush are not — Greek routinely welds the two roots into a single orthographic word with a linking vowel in the middle. ανεμόμυλος (windmill), ελαιόλαδο (olive oil), οδοντόβουρτσα (toothbrush), σαββατοκύριακο (weekend): one word each, and each one declines as a unit.

This matters practically, because a compound is a new noun with its own gender, its own paradigm and its own stress — none of which you can read off the parts without knowing the rules. Those rules are the point of this page.

The basic recipe: stem + ο + stem

The overwhelming majority of Greek noun compounds are built as stem of word A + the linking vowel -ο- + full word B. Strip the ending off the first word, glue on -ο-, and add the second word whole.

The linking vowel is always -ο-, whatever the first word's own ending was. νύχτα is feminine in -α and χαρτί is neuter in -ί, but both give νυχτ-ο- and χαρτ-ο-. This is the most reliable single fact about Greek compounding; see The Linking Vowel -ο- for the full treatment.

Head-final: the last element runs everything

This is the rule that saves you the most trouble. A Greek noun compound is head-final — the last element is the head, and it dictates the compound's gender, its declension class and its plural. The first element is just a modifier.

η νύχτα is feminine, yet το νυχτοπούλι is neuter, because the head is το πουλί. Do not let the first element mislead you — grammatically it is not even a word any more, just a stem.

The flip side is equally important: only the final element inflects. Everything before the linking vowel is frozen for good.

Where does the stress go?

Here is the honest part. Greek compounds show a strong pull towards antepenultimate stress — the accent retreats leftward from wherever the second element carried it:

• ο μύλος → ο ανεμόμυλος
• ο τόπος → ο παιδότοπος
• το νόμισμα → το χαρτονόμισμα
• η βούρτσα → η οδοντόβουρτσα

But it is a pull, not a law. Plenty of transparent, everyday compounds keep the stress on the penult instead: το νυχτοπούλι, το καλοκαίρι, το Σαββατοκύριακο (this one is antepenultimate counting from the end — σαβ-βα-το-κύ-ρια-κο — but only because -ρια- counts as one syllable). There is no derivation that will hand you the answer every time. Learn the compound's stress with the compound, the way you learn it with any other noun.

Two productive families worth memorising

Rather than treating every compound as a one-off, notice the patterns that keep producing new words.

Shop-and-workshop nouns in -είο — "the place where this trade is carried on":

• -πωλείο = a place that sells (from πωλώ "sell"): το βιβλιοπωλείο (bookshop), το ανθοπωλείο (florist), το κρεοπωλείο (butcher's), το γαλακτοπωλείο (dairy shop).
• -ποιείο = a place that makes (from ποιώ "make"): το αρτοποιείο (bakery), το ζυθοποιείο (brewery), το οινοποιείο (winery).
• Plain -είο on the name of the tradesman or the trade, with neither of those two verbs inside: το ζαχαροπλαστείο (patisserie, from ο ζαχαροπλάστης "pastry chef"), το κουρείο (barber's, from ο κουρέας), το φαρμακείο (pharmacy, from το φάρμακο).

The suffix doing the work in all three rows is -είο; -πωλείο and -ποιείο are just the two sub-patterns frequent enough to be worth recognising on sight. Meet an unfamiliar noun in -είο and you can safely guess it names a place of business.

Copulative compounds — two nouns of equal weight, meaning "A and B together":

• τα μαχαιροπίρουνα (μαχαίρι + πιρούνι = cutlery), το αλατοπίπερο (salt and pepper), το ανδρόγυνο (άνδρας + γυνή = a married couple), τα αδερφοξάδερφα (siblings and cousins, the extended family).

Loose compounds: noun + noun with a hyphen

Alongside the fused type, Greek has a looser pattern: two full nouns written with a hyphen, where the second characterises the first. This is the productive, modern, journalistic strategy.

• η λέξη-κλειδί (keyword), το παιδί-θαύμα (child prodigy), η επίσκεψη-αστραπή (a lightning visit), ο δημοσιογράφος-ερευνητής (investigative journalist), το πλοίο-φάντασμα (ghost ship).

The crucial difference from the fused type: here both elements usually inflect.

When the second noun is functioning purely as an intensifier of manner, though, it typically stays invariable: επισκέψεις-αστραπή, τιμές-φωτιά (sky-high prices, a newspaper favourite).

The third strategy: noun + genitive

Greek does not compound everything. Very often — and this is where English speakers slip — the equivalent of an English two-word noun phrase is a Greek noun followed by another noun in the genitive.

There is no shortcut for deciding which of the three a given concept uses — it is lexical. What you must not do is the fourth thing, which is stack two nominatives the way English does. Η στάση λεωφορείο is not Greek.

Why Greek fuses where English does not

A last observation that pays off in reading. English can leave two nouns side by side because its word order is rigid enough to tell you which one modifies which. Greek word order is free, so a bare noun noun sequence would be ambiguous — is it "fish tavern" or "tavern fish"? The language therefore marks the relationship explicitly, either by fusing (ψαροταβέρνα), by hyphenating (λέξη-κλειδί) or by case (στάση λεωφορείου). All three are ways of doing the job English does with position alone.

The practical payoff is that a long unfamiliar Greek word is often just two familiar words in a coat. ουρανοξύστης = ουρανός + ξύνω, "sky-scratcher". λεωφορείο = λεώς "people" + φέρω "carry", a people-carrier — which is why the Greek for "bus" is one word where English needs a borrowed one.

Common Mistakes

1. Writing the compound as two words. English habit; Greek writes one word.

2. Taking the gender from the first element. The head is the last element, always.

3. Dropping the linking -ο-. Without it the word is not a compound, just a collision.

4. Inflecting the first element. Only the head takes case and number endings.

5. Stacking two nominatives like English. Use the genitive.

Key Takeaways

• The standard recipe is stem + -ο- + word: ανεμ-ό-μυλος, νυχτ-ο-πούλι, ψαρ-ο-ταβέρνα. The linking vowel is practically always -ο-, regardless of the first word's own ending.
• Compounds are head-final: the last element supplies the gender, the declension and the plural. η νύχτα + το πουλί = το νυχτοπούλι.
• Only the final element inflects. του ανεμόμυλου, τους ανεμόμυλους — the first stem is frozen.
• Learned compounding stems differ from the everyday word: δόντι → οδοντ-, χέρι → χειρ-, κρέας → κρε-.
• Stress tends to retreat towards the antepenult (ανεμόμυλος, παιδότοπος, χαρτονόμισμα) but not reliably (νυχτοπούλι, καλοκαίρι) — memorise it with the word.
• Greek has three strategies where English has one: fused compound (ελαιόλαδο), hyphenated juxtaposition with both parts inflecting (λέξεις-κλειδιά), and noun + genitive (στάση λεωφορείου). Never stack two nominatives.