trough vs incurvation

trough and incurvation both are nouns.

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

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

Other hypernyms of trough include concave shape, concavity, incurvature.

trough (noun)	incurvation (noun)
a channel along the eaves or on the roof; collects and carries away rainwater	the action of creating a curved shape
a container (usually in a barn or stable) from which cattle or horses feed	a shape that curves or bends inward
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