mug vs fall guy

mug and fall guy both are nouns.

Word	Noun	Adjective	Verb	Adverb
mug	Yes	No	Yes	No
fall guy	Yes	No	No	No

As nouns, mug and fall guy are synonyms defined as:

mug and fall guy: a person who is gullible and easy to take advantage of

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

mug (noun)	fall guy (noun)
with handle and usually cylindrical	a person who is gullible and easy to take advantage of
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)	fall guy (verb)
To stare awkwardly
rob at gunpoint or with the threat of violence