muddy vs alter

muddy is an adjective but alter is not an adjective.

Word	Noun	Adjective	Verb	Adverb
muddy	No	Yes	Yes	No
alter	No	No	Yes	No

As verbs, alter is a hypernym of muddy; that is, alter is a word with a broader meaning than muddy:

Other hypernyms of muddy include change, modify.

muddy (adjective)	alter (adjective)
dirty and messy; covered with mud or muck
(of color) discolored by impurities; not bright and clear
(of liquids) clouded as with sediment
(of soil) soft and watery

muddy (verb)	alter (verb)
make turbid	remove the ovaries of
cause to become muddy	become different in some particular way, without permanently losing one's or its former characteristics or essence
dirty with mud	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to