stable gear vs housing

stable gear and housing both are nouns.

Word	Noun	Adjective	Verb	Adverb
stable gear	Yes	No	No	No
housing	Yes	No	No	No

As nouns, housing is a hyponym of stable gear; that is, housing is a word with a more specific, narrower meaning than stable gear:

stable gear: gear for a horse
housing: stable gear consisting of a decorated covering for a horse, especially (formerly) for a warhorse

stable gear (noun)	housing (noun)
gear for a horse	structures collectively in which people are housed
	a protective cover designed to contain or support a mechanical component
	stable gear consisting of a decorated covering for a horse, especially (formerly) for a warhorse