pluperfect tense vs pluperfect

pluperfect tense and pluperfect both are nouns.

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

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

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

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

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

pluperfect tense (adjective)	pluperfect (adjective)
	more than perfect