You don't have many options when it comes to ending a word with a J, but that's why people need a helping hand in such moments! In fact, there are only seven words available, but your best bet is always 'Hajj', a smooth 21/24 point earner for when things look dire. Less is more sometimes, especially in the world of Scrabble and Words with Friends!
You can also find a list of all words that start with J
and words with J