dirty vs muck up

dirty is an adjective but muck up is not an adjective.

Word	Noun	Adjective	Verb	Adverb
dirty	No	Yes	Yes	No
muck up	No	No	Yes	No

As verbs, muck up is a hyponym of dirty; that is, muck up is a word with a more specific, narrower meaning than dirty:

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

dirty (adjective)	muck up (adjective)
soiled or likely to soil with dirt or grime
(of behavior or especially language) characterized by obscenity or indecency
spreading pollution or contamination; especially radioactive contamination
unethical or dishonest
expressing or revealing hostility or dislike
obtained illegally or by improper means
(of a manuscript) defaced with changes
(of color) discolored by impurities; not bright and clear
vile; despicable
contaminated with infecting organisms
unpleasantly stormy
violating accepted standards or rules

dirty (verb)	muck up (verb)
make soiled, filthy, or dirty	soil with mud, muck, or mire
	make a mess of, destroy or ruin