A noun is commonly defined as a word that stands for a person, place or thing.
Natanya = person; store = place; book = thing.
Declensions: First, Second, Third
A declension is a grouping of nouns that are inflected with a shared set of endings.
1. First declension nouns are characterized by an h or a and are mostly feminine.
2. The second declension nouns are characterized by an o as the final letter of the stem. They are largely masculine or neuter.
3. Third declension nouns have stems that end in a consonant.
Greek nouns are assumed to be indefinite unless marked by the definite article (“the”). o[ = masculine (“the”); h[ = feminine (“the”); to< = neuter (“the”). The article can also, at points, be translated as a personal pronoun (I, you, he/she/it, they), a demonstrative pronoun (this/that//these/those) or a relative pronoun (who/which). Sometimes with names and abstracts it is best left untranslated.
Greek nouns are masculine, feminine, or neuter in gender. Often this gender is more a syntactic feature than a metaphysical statement as many inanimate objects are given grammatical gender. Gender is indicated by the definite article.