mug vs mugging

mug and mugging both are nouns.

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

mug (noun)	mugging (noun)
with handle and usually cylindrical	assault with intent to rob
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

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