future perfect tense vs future perfect

future perfect tense and future perfect both are nouns.

Word	Noun	Adjective	Verb	Adverb
future perfect tense	Yes	No	No	No
future perfect	Yes	No	No	No

As nouns, future perfect tense and future perfect are synonyms defined as:

future perfect tense and future perfect: a perfective tense used to describe action that will be completed in the future

future perfect tense (noun)	future perfect (noun)
a perfective tense used to describe action that will be completed in the future	a perfective tense used to describe action that will be completed in the future