Difference between Haj and Hajj

What is the difference between Haj and Hajj?

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

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