saddleback roof vs trough

saddleback roof and trough both are nouns.

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

saddleback roof (noun)	trough (noun)
a double sloping roof with a ridge and gables at each end	a channel along the eaves or on the roof; collects and carries away rainwater
	a container (usually in a barn or stable) from which cattle or horses feed
	a long narrow shallow receptacle
	a narrow depression (as in the earth or between ocean waves or in the ocean bed)
	a treasury for government funds
	a concave shape with an open top