decrease vs narrowing

decrease and narrowing both are nouns.

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

As nouns, narrowing is a hyponym of decrease; that is, narrowing is a word with a more specific, narrower meaning than decrease:

Other hyponyms of decrease include decay, decline, decline, diminution, desensitisation, desensitization, slippage, wastage.

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

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

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