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

• fit for purpose
• fitful
• fitfully
• fitfulness
• fitfulnesses
• fit in
• fitlier
• fitliest
• fit like a glove
• fitly
• fitment
• fitments
• fitness
• fitnesses
• fitness walker
• fitness walkers
• fit of the face
• fit on
• fit out
• fit-out
• fit-outs
• fits
• fits and starts
• fits of the mother
• fitt