mug vs mugful

mug and mugful both are nouns.

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

As nouns, mug and mugful are synonyms defined as:

mug (noun)	mugful (noun)
with handle and usually cylindrical	the quantity that can be held in a mug
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)	mugful (verb)
To stare awkwardly
rob at gunpoint or with the threat of violence