Are there any words that end with J?
Yes, there are.
Raj. It was the name for the British Empire in India. We understand haj (hadj and hajj are variants) to be a Muslim pilgrimage to Mecca.
You may refer to the related question below for words that end with J.
Words that both start with J and end with J, there are none recorded, except possibly obscure acronyms and abbreviations. However, there are innumerable words that start with J, and a few, mainly direct imports from India, that end with J, such as: raj, haj, taj, benj, hadj, hajj, munj, aflaj, falaj, svaraj, swaraj.