narrow vs narrowed

narrow is a noun but narrowed is not a noun.

Word	Noun	Adjective	Verb	Adverb
narrow	Yes	Yes	Yes	No
narrowed	No	Yes	No	No

narrow (noun)	narrowed (noun)
a narrow strait connecting two bodies of water

narrow (adjective)	narrowed (adjective)
not wide	made narrow; limited in breadth
very limited in degree	reduced in size as by squeezing together
lacking tolerance or flexibility or breadth of view
characterized by painstaking care and detailed examination
limited in extent or scope

narrow (verb)	narrowed (verb)
make or become more narrow or restricted
become tight or as if tight
become more focused on an area of activity or field of study
define clearly