perfective verb vs verb

perfective verb and verb both are nouns.

Word	Noun	Adjective	Verb	Adverb
perfective verb	Yes	No	No	No
verb	Yes	No	No	No

As nouns, verb is a hypernym of perfective verb; that is, verb is a word with a broader meaning than perfective verb:

perfective verb: a verb form expressing action as complete or as implying the notion of completion, conclusion, or result.
verb: a content word that denotes an action, occurrence, or state of existence

perfective verb (noun)	verb (noun)
a verb form expressing action as complete or as implying the notion of completion, conclusion, or result.	a content word that denotes an action, occurrence, or state of existence
	the word class that serves as the predicate of a sentence