housing vs youth hostel

housing and youth hostel both are nouns.

Word	Noun	Adjective	Verb	Adverb
housing	Yes	No	No	No
youth hostel	Yes	No	No	No

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

housing: structures collectively in which people are housed
youth hostel: inexpensive supervised lodging (especially for youths on bicycling trips)

housing (noun)	youth hostel (noun)
structures collectively in which people are housed	inexpensive supervised lodging (especially for youths on bicycling trips)
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