mug vs pudding face

mug and pudding face both are nouns.

Word	Noun	Adjective	Verb	Adverb
mug	Yes	No	Yes	No
pudding face	Yes	No	No	No

As nouns, pudding face is a hyponym of mug; that is, pudding face is a word with a more specific, narrower meaning than mug:

mug: the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
pudding face: a large fat human face

Other hyponyms of mug include pudding-face.

mug (noun)	pudding face (noun)
with handle and usually cylindrical	a large fat human face
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)	pudding face (verb)
To stare awkwardly
rob at gunpoint or with the threat of violence