cullis vs trough

cullis and trough both are nouns.

Word	Noun	Adjective	Verb	Adverb
cullis	Yes	No	No	No
trough	Yes	No	No	No

As nouns, trough is a hypernym of cullis; that is, trough is a word with a broader meaning than cullis:

cullis: a gutter in a roof
trough: a channel along the eaves or on the roof; collects and carries away rainwater

Other hypernyms of cullis include gutter.

cullis (noun)	trough (noun)
a gutter in a roof	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