Judges
Jealousy is an emotion. It begins with the letter J.
jumanji
Jasmiine
juice
That would be a juniper tree.
Some 5-letter words beginning with 'j' are:jabotjauntjazzyjeansjellyjennyjettyjeweljiffyjimmyjointjoistjokerjollyjoulejoustjowlyjudgejuicejuicyjulepjumbojumpyjunkyjuror
jersey
JAG
javelin
· Jug
Jerk
Jackson Hole