grime vs colly

grime is a noun but colly is not a noun.

Word	Noun	Adjective	Verb	Adverb
grime	Yes	No	Yes	No
colly	No	No	Yes	No

As verbs, grime and colly are synonyms defined as:

Other synonyms of grime include begrime, bemire, dirty, soil.

grime (noun)	colly (noun)
anything regarded as making something unclean

grime (verb)	colly (verb)
make soiled, filthy, or dirty	make soiled, filthy, or dirty