past perfect vs perfective

past perfect and perfective both are nouns.

Word	Noun	Adjective	Verb	Adverb
past perfect	Yes	No	No	No
perfective	Yes	No	No	No

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

past perfect: a perfective tense used to express action completed in the past
perfective: a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect)

Other hypernyms of past perfect include perfect, perfect tense, perfective tense.

past perfect (noun)	perfective (noun)
a perfective tense used to express action completed in the past	the aspect of a verb that expresses a completed action
	a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect)