As detailed above, ‘study’ can be a verb or a noun. Noun usage: My study was to avoid disturbing her. Noun usage: The study of languages is fascinating. Noun usage: I made a careful study of his sister.

Is study a verb?

verb (used with object), stud·ied, stud·y·ing. to apply oneself to acquiring a knowledge of (a subject). to examine or investigate carefully and in detail: to study the political situation.

Is study a noun or an adjective?

​noun. UK /ˈstʌdi/ study verb. case study noun. self-study noun.