muck about vs monkey

muck about is not a noun while monkey is a noun.

Word	Noun	Adjective	Verb	Adverb
muck about	No	No	Yes	No
monkey	Yes	No	Yes	No

As verbs, muck about and monkey are synonyms defined as:

muck about and monkey: do random, unplanned work or activities or spend time idly

Other synonyms of muck about include mess around, monkey around, muck around, potter, putter, tinker.

muck about (noun)	monkey (noun)
	any of various long-tailed primates (excluding the prosimians)
	one who is playfully mischievous

muck about (verb)	monkey (verb)
do random, unplanned work or activities or spend time idly	do random, unplanned work or activities or spend time idly
	play around with or alter or falsify, usually secretively or dishonestly