idiom (n.)

• argot
• cant
• clause
• cliche
• composition
• construction
• dialect
• diction
• expression
• formulation
• grammar
• jargon
• language
• lingo
• lingua
• localism
• locution
• paragraph
• parlance
• parole
• patois
• period
• phrase
• phraseology
• phrasing
• provincialism
• regionalism
• rhetoric
• sentence
• speech
• talk
• term
• tongue
• usage
• utterance
• verbalism
• verbiage
• vernacular
• wording