househusband vs husband

househusband and husband both are nouns.

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

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

househusband: a husband who keeps house while his wife earns the family income
husband: a married man; a woman's partner in marriage

Other hypernyms of househusband include hubby, married man.

househusband (noun)	husband (noun)
a husband who keeps house while his wife earns the family income	a married man; a woman's partner in marriage

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