muck about vs monkey around

muck about and monkey around both are verbs.

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

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

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

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

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