Writing prose, anything goes. Common four-letter words (in this sense) that are widely considered vulgar or offensive to a notable degree include: cunt, fuck (and regional variants such as feck, fick and foak), jism (or gism), jizz, piss, twat and tits. Work Is a Four-Letter Word is the title of a 1968 British comedy film. 2  That Four-Letter Word is a 2006 independent film from India. 3  Welsh punk band Four Letter Word, formed in 1991, named themselves after the phrase.