narrowing vs constricting

narrowing is a noun but constricting is not a noun.

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

As adjectives, narrowing and constricting are synonyms defined as:

narrowing and constricting: (of circumstances) tending to constrict freedom

Other synonyms of narrowing include constrictive.

narrowing (noun)	constricting (noun)
the act of making something narrower
an instance of becoming narrow
a decrease in width

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