pluperfect tense vs past perfect

pluperfect tense and past perfect both are nouns.

Word	Noun	Adjective	Verb	Adverb
pluperfect tense	Yes	No	No	No
past perfect	Yes	No	No	No

As nouns, pluperfect tense and past perfect are synonyms defined as:

pluperfect tense and past perfect: a perfective tense used to express action completed in the past

Other synonyms of pluperfect tense include past perfect tense, pluperfect.

pluperfect tense (noun)	past perfect (noun)
a perfective tense used to express action completed in the past	a perfective tense used to express action completed in the past