vacation home vs dwelling

vacation home and dwelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacation home	Yes	No	No	No
dwelling	Yes	No	No	No

As nouns, dwelling is a hypernym of vacation home; that is, dwelling is a word with a broader meaning than vacation home:

vacation home: a dwelling (a second home) where you live while you are on vacation
dwelling: housing that someone is living in

Other hypernyms of vacation home include abode, domicile, dwelling house, habitation, home.

vacation home (noun)	dwelling (noun)
a dwelling (a second home) where you live while you are on vacation	housing that someone is living in