gambrel roof vs saddle roof

gambrel roof and saddle roof both are nouns.

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

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

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

gambrel roof (noun)	saddle 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