Difference between Hajj and Haj

What is the difference between Hajj and Haj?

Hajj as a noun is the pilgrimage to mecca made by pious muslims; one of the five pillars while Haj as a noun is the pilgrimage to mecca made by pious muslims; one of the five pillars of islam.

We hope you now know whether to use Hajj or Haj in your sentence.