gambrel roof vs gable roof

gambrel roof and gable roof both are nouns.

Word	Noun	Adjective	Verb	Adverb
gambrel roof	Yes	No	No	No
gable roof	Yes	No	No	No

As nouns, gable roof is a hypernym of gambrel roof; that is, gable roof is a word with a broader meaning than gambrel roof:

gambrel roof: a gable roof with two slopes on each side and the lower slope being steeper
gable roof: a double sloping roof with a ridge and gables at each end

Other hypernyms of gambrel roof include saddle roof, saddleback, saddleback roof.

gambrel roof (noun)	gable roof (noun)
a gable roof with two slopes on each side and the lower slope being steeper	a double sloping roof with a ridge and gables at each end