trough vs saddleback roof

trough and saddleback roof both are nouns.

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

trough (noun)	saddleback roof (noun)
a channel along the eaves or on the roof; collects and carries away rainwater	a double sloping roof with a ridge and gables at each end
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