mug vs human head

mug and human head both are nouns.

Word	Noun	Adjective	Verb	Adverb
mug	Yes	No	Yes	No
human head	Yes	No	No	No

mug (noun)	human head (noun)
with handle and usually cylindrical	the head of a human being
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)	human head (verb)
To stare awkwardly
rob at gunpoint or with the threat of violence