Some four letter J words are:
A four letter word that starts with J and ends with M: jism.
A four letter word starting with J is jump or joke.
jump.
Hadj
Some four letter words that start with J are:jokeJunejustjuryjailJoveJerkjumpjestjeerjunkjive
ajar mojo
Jerk
jackjailjerkjiltjokejoinjoltjumpjustjunk
jest
jolt just jump
Fuji
JunkJambJustJoinJail