gambrel roof vs saddleback

gambrel roof and saddleback both are nouns.

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

As nouns, saddleback is a hypernym of gambrel roof; that is, saddleback 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
saddleback: a double sloping roof with a ridge and gables at each end

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

gambrel roof (noun)	saddleback (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
	a pass or ridge that slopes gently between two peaks (is shaped like a saddle)