The word "noun" comes from the latin nomen meaning "name." Word classes like nouns were first described by Sanskrit grammarian Pв?ini and ancient Greeks like Dionysios Thrax, and defined in terms of their morphological properties. For example, in Ancient Greek, nouns can be inflected for grammatical case, such as dative or accusative. Verbs, on the other hand, can be inflected for tenses, such as past, present or future, while nouns cannot. Aristotle also had a notion of onomata (nouns) and rhemata..