Synonyms for Twat (same or very similar meaning)
WordNet sense 1 (a man who is a stupid incompetent fool):
bozo, cuckoo, fathead, goof, goofball, goose, jackass, zanyWordNet sense 2 (obscene terms for female genitals):
cunt, puss, pussy, slit, snatch, pussyFrom the ODE community, based on WordNetadd/edit