monkey around vs muck around

monkey around and muck around both are verbs.

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

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

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

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

monkey around (verb)	muck around (verb)
do random, unplanned work or activities or spend time idly	do random, unplanned work or activities or spend time idly