back-formation

The process by which a new word is formed from an older word by interpreting the former as a derivative of the latter, often by removing a morpheme (real or perceived) from the older word, such as the verb burgle, formed by removing -ar (perceived as an agent-noun suffix) from burglar.

A word created in this way.

“Back-formations, such as "tambour" (for "play the tambourine"), are a staple of comedic wordplay.”