inn vs roadhouse

inn and roadhouse both are nouns.

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

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

inn: 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 inn include caravan inn, caravansary, caravanserai, khan, imaret, post house, posthouse.

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