Nouns

(n)mug, mugfulthe quantity that can be held in a mug
(n)chump, fool, gull, mark, patsy, sucker, soft touch, muga person who is gullible and easy to take advantage of
(n)countenance, physiognomy, phiz, visage, kisser, smiler, mugthe human face (‘kisser’ and ‘smiler’ and ‘mug’ are informal terms for ‘face’ and ‘phiz’ is British)
(n)mugwith handle and usually cylindrical

Verbs

(v)mugrob at gunpoint or with the threat of violence“I was mugged in the streets of New York last night”
(v)mugTo stare awkwardly