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In page History of linguistics:

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In semantics, the early Sanskrit grammarian Śākaṭāyana (before c. 500 BCE) proposes that verbs represent ontologically prior categories, and that all nouns are etymologically derived from actions. The etymologist Yāska (c. 5th century BCE) posits that meaning inheres in the sentence, and that word meanings are derived based on sentential usage. He also provides four categories of words—nouns, verbs, pre-verbs, and particles/invariants—and a test for nouns both concrete and abstract: words which can be indicated by the pronoun that.[citation needed]