Synonyms for Ham (same or very similar meaning)
WordNet sense 1 (an unskilled actor who overacts):
ham actorWordNet sense 2 (meat cut from the thigh of a hog (usually smoked)):
gammon, jambonWordNet sense 3 (exaggerate one's acting):
overact, overplay, ham it upFrom the ODE community, based on WordNetadd/edit