Fuji
Reenact. -J
jumpy, jealous
juniper, jumping, joshing, jarring, jesting
A seven letter word that can be made from those letters is franker (comparative form of the adjective 'frank').
A four letter word starting with J is jump or joke.
joust
jamoke
Fuji
JunkJambJustJoinJail
java
Possibly 'jurisdiction.'
junta, jelly, joust
joyful
jazz
i dont know the answer either!
June