mutter vs maunder

mutter is a noun but maunder is not a noun.

Word	Noun	Adjective	Verb	Adverb
mutter	Yes	No	Yes	No
maunder	No	No	Yes	No

As verbs, mutter and maunder are synonyms defined as:

Other synonyms of mutter include mumble, mussitate.

mutter (noun)	maunder (noun)
a complaint uttered in a low and indistinct tone
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech

mutter (verb)	maunder (verb)
make complaining remarks or noises under one's breath	talk indistinctly; usually in a low voice
talk indistinctly; usually in a low voice	speak (about unimportant matters) rapidly and incessantly
	wander aimlessly