Underground Railway vs flight

Underground Railway and flight both are nouns.

Word	Noun	Adjective	Verb	Adverb
Underground Railway	Yes	No	No	No
flight	Yes	No	Yes	No

Underground Railway (noun)	flight (noun)
secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War	an instance of traveling by air
	the act of escaping physically
	a scheduled trip by plane between designated airports
	a stairway (set of steps) between one floor or landing and the next
	passing above and beyond ordinary bounds
	an air force unit smaller than a squadron
	a formation of aircraft in flight
	a flock of flying birds
	the path followed by an object moving through space