vacation home vs dwelling house

vacation home and dwelling house both are nouns.

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

As nouns, dwelling house is a hypernym of vacation home; that is, dwelling house 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 house: housing that someone is living in

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

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