chump vs mug

chump and mug both are nouns.

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

As nouns, chump and mug are synonyms defined as:

Other synonyms of chump include fall guy, fool, gull, mark, patsy, soft touch, sucker.

chump (noun)	mug (noun)
a person who is gullible and easy to take advantage of	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

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