back-formation (noun)

1. In the world of magic and dragons, back-formation would suggest that 'wizard' was derived from 'wiz' instead of the other way around.

2. The stand-up comedian made a hilarious back-formation when he joked that 'blame' came from 'blameful'.

3. In the anime series, the young protagonist mistakenly believes that 'samurai' was a back-formation originating from 'samu'.

4. The artist created a thought-provoking exhibit featuring a back-formation, proposing that 'masterpiece' originated from 'master' alone.