muck around vs putter

muck around is not a noun while putter is a noun.

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

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

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

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

muck around (noun)	putter (noun)
	the iron normally used on the putting green
	a golfer who is putting

muck around (verb)	putter (verb)
do random, unplanned work or activities or spend time idly	move around aimlessly
	do random, unplanned work or activities or spend time idly
	work lightly