hubby vs spouse

hubby and spouse both are nouns.

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

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

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

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