roof vs saddleback

roof and saddleback both are nouns.

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

As nouns, saddleback is a hyponym of roof; that is, saddleback is a word with a more specific, narrower meaning than roof:

roof (noun)	saddleback (noun)
a protective covering that covers or forms the top of a building	a double sloping roof with a ridge and gables at each end
protective covering on top of a motor vehicle	a pass or ridge that slopes gently between two peaks (is shaped like a saddle)
an upper limit on what is allowed
the inner top surface of a covered area or hollow space

roof (verb)	saddleback (verb)
provide a building with a roof; cover a building with a roof