lamp housing vs housing

lamp housing and housing both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamp housing	Yes	No	No	No
housing	Yes	No	No	No

As nouns, housing is a hypernym of lamp housing; that is, housing is a word with a broader meaning than lamp housing:

lamp housing: housing that holds a lamp (as in a movie projector)
housing: a protective cover designed to contain or support a mechanical component

lamp housing (noun)	housing (noun)
housing that holds a lamp (as in a movie projector)	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