Jerk
jonquil
Some 5-letter words beginning with 'j' are:jabotjauntjazzyjeansjellyjennyjettyjeweljiffyjimmyjointjoistjokerjollyjoulejoustjowlyjudgejuicejuicyjulepjumbojumpyjunkyjuror
Jaunt.
Jovial jewel
Java
There are no words in the English language that begin and end with the letter j.
Jesu
jackpot
Jackal, jaguar, jellyfish and jungles are scary. They begin with the letter J.
jack jest jilt joke jury
jade.... jump jury... joke... jive...