thirties vs decade

thirties and decade both are nouns.

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

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

Other hypernyms of thirties include decennary, decennium.

thirties (noun)	decade (noun)
the time of life between 30 and 40	the cardinal number that is the sum of nine and one; the base of the decimal system
the decade from 1930 to 1939	a period of 10 years