mugger vs mug

mugger and mug both are nouns.

Word	Noun	Adjective	Verb	Adverb
mugger	Yes	No	No	No
mug	Yes	No	Yes	No

mugger (noun)	mug (noun)
a robber who takes property by threatening or performing violence on the person who is robbed (usually on the street)	with handle and usually cylindrical
	the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
	a person who is gullible and easy to take advantage of
	the quantity that can be held in a mug

mugger (verb)	mug (verb)
	To stare awkwardly
	rob at gunpoint or with the threat of violence