fixer-upper vs dwelling house

fixer-upper and dwelling house both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixer-upper	Yes	No	No	No
dwelling house	Yes	No	No	No

As nouns, dwelling house is a hypernym of fixer-upper; that is, dwelling house is a word with a broader meaning than fixer-upper:

fixer-upper: a house or other dwelling in need of repair (usually offered for sale at a low price)
dwelling house: housing that someone is living in

Other hypernyms of fixer-upper include abode, domicile, dwelling, habitation, home.

fixer-upper (noun)	dwelling house (noun)
a house or other dwelling in need of repair (usually offered for sale at a low price)	housing that someone is living in