runway vs sloping trough

runway and sloping trough both are nouns.

Word	Noun	Adjective	Verb	Adverb
runway	Yes	No	No	No
sloping trough	Yes	No	No	No

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

Other hypernyms of runway include chute, slide, slideway.

runway (noun)	sloping trough (noun)
a strip of level paved surface where planes can take off and land	sloping channel through which things can descend
a narrow platform extending from the stage into the audience in a theater or nightclub etc.
a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
a chute down which logs can slide