malapropism /malˈə-pro-pi-zm/

1. The misapplication of words without mispronunciation, from Mrs Malaprop in Sheridan's play, The Rivals, who uses words malapropos
2. A word so used

• custard pie
• custard pies
• custard powder
• custard powders
• custards
• custard tart
• custard tarts
• custock
• custocks
• custode
• custodes
• custodial
• custodian
• custodians
• custodianship
• custodianships
• custodier
• custodiers
• custodies
• custody
• custom
• customable
• customaries
• customarily
• customariness