Most first declension Greek nouns end in ᾱ or η. All such nouns are feminine in gender. The long alpha is found only in words whose stems end in ε, ι or ρ. First declension nouns in ᾱ/η are declined with the following endings:
|Nominative in -η||Nominative in -ᾱ|
* To decline any noun, you should take the genitive singular form (which can be found in a proper dictionary entry) and remove the ending; to that stem add the appropriate ending for the case and number required.
Nouns have persistent accent, as a general rule. However, the plural genitive of first declension nouns always takes a circumflex on the ultima. And when the accent of the genitive singular is on the ultima, both the genitive and dative will take a circumflex accent, singular and plural. In addition, the plural declension marker -αι is always counted as short for the purpose of determining accent.