Synonyms for Asshole (same or very similar meaning)
WordNet sense 1 (insulting terms of address for people who are stupid or irritating or ridiculous):
cocksucker, motherfucker, prick, shit, dickhead, whoreson, mother fucker, son of a bitchWordNet sense 2 (excretory opening at the end of the alimentary canal):
arseFrom the ODE community, based on WordNetadd/edit