A four letter word starting with J is jump or joke.
Wiki User
∙ 13y agoRussell Worrell
Wiki User
∙ 16y agoJump
jazz
June
joust
jamoke
Fuji
JunkJambJustJoinJail
java
jamb - The piece of the door frame that the door closes against.
Ajar
Possibly 'jurisdiction.'
junta, jelly, joust
joyful