3-letter words that start with J are 3 and 4-letter words that start with J are 2. 5-letter words that start with J is 1 and 6-letter words that start with J are 5. 7-letter words that start with J are 5 and 8-letter words that start with J is 1. 9-letter words that start with J is 1. Total start with J are 18.