hostel vs roadhouse

hostel and roadhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
hostel	Yes	No	No	No
roadhouse	Yes	No	No	No

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

hostel: a hotel providing overnight lodging for travelers
roadhouse: an inn (usually outside city limits on a main road) providing meals and liquor and dancing and (sometimes) gambling

Other hyponyms of hostel include caravan inn, caravansary, caravanserai, khan, imaret, post house, posthouse.

hostel (noun)	roadhouse (noun)
inexpensive supervised lodging (especially for youths on bicycling trips)	an inn (usually outside city limits on a main road) providing meals and liquor and dancing and (sometimes) gambling
a hotel providing overnight lodging for travelers