husband vs spouse

husband and spouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
husband	Yes	No	Yes	No
spouse	Yes	No	No	No

As nouns, spouse is a hypernym of husband; that is, spouse is a word with a broader meaning than husband:

Other hypernyms of husband include adult male, man, better half, married person, mate, partner.

husband (noun)	spouse (noun)
a married man; a woman's partner in marriage	a person's partner in marriage

husband (verb)	spouse (verb)
use cautiously and frugally