narrowing vs decrease

narrowing and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
narrowing	Yes	Yes	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of narrowing; that is, decrease is a word with a broader meaning than narrowing:

Other hypernyms of narrowing include decrement.

narrowing (noun)	decrease (noun)
the act of making something narrower	the act of decreasing or reducing something
an instance of becoming narrow	the amount by which something decreases
a decrease in width	a change downward
	a process of becoming smaller or shorter

narrowing (adjective)	decrease (adjective)
(of circumstances) tending to constrict freedom
becoming gradually narrower

narrowing (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller