nineties vs decade

nineties and decade both are nouns.

Word	Noun	Adjective	Verb	Adverb
nineties	Yes	No	No	No
decade	Yes	No	No	No

As nouns, decade is a hypernym of nineties; that is, decade is a word with a broader meaning than nineties:

Other hypernyms of nineties include decennary, decennium.

As nouns, decade is a hypernym of nineties; that is, decade is a word with a broader meaning than nineties:

Other hypernyms of nineties include decennary, decennium.

nineties (noun)	decade (noun)
the time of life between 90 and 100	the cardinal number that is the sum of nine and one; the base of the decimal system
the decade from 1990 to 1999	a period of 10 years
the decade from 1890 to 1899