grime vs mud

grime and mud both are nouns.

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

As verbs, mud is a hyponym of grime; that is, mud is a word with a more specific, narrower meaning than grime:

Other hyponyms of grime include foul, contaminate, foul, pollute, smear, slime, muddy, muddy up, splash, mire, muck, muck up, crock, blemish, spot.

grime (noun)	mud (noun)
anything regarded as making something unclean	slanderous remarks or charges
	water soaked soil; soft wet earth

grime (verb)	mud (verb)
make soiled, filthy, or dirty	soil with mud, muck, or mire
	plaster with mud