1530s vs decade

1530s and decade both are nouns.

Word	Noun	Adjective	Verb	Adverb
1530s	Yes	No	No	No
decade	Yes	No	No	No

As nouns, decade is a hypernym of 1530s; that is, decade is a word with a broader meaning than 1530s:

Other hypernyms of 1530s include decennary, decennium.

1530s (noun)	decade (noun)
the decade from 1530 to 1539	the cardinal number that is the sum of nine and one; the base of the decimal system
	a period of 10 years