dirty_word
1. [ noun ] (linguistics) a word that is considered to be unmentionable
Examples:

"`failure' is a dirty word to him"

Related terms: word
2. [ noun ] an offensive or indecent word or phrase
Synonyms: vulgarism obscenity
Related terms: profanity bawdry scatology asshole bull crap chickenshit peeing fuck bugger_all cock shitless
Similar spelling:   dirty_war