Change 1 letter to make a new word #2

The word is in Urban Dictionary. It is slang, but probably making its way slowly to other dictionaries. I do not have any problem with the use of abbreviations, slang in the game. If others have problems with it, we can ask them to explain their reasons for objection. The game is hard as it is without such constraints

Cover

Clever

Fever

nevel

a stroke or blow with the fist.

Navel

ravel