The comparative literature has not settled this. Using one tradition's word for the others carries with it a juridical, posthumous and universal notion of holiness that the wali, the tzadik, the sant and the arhat do not each share, and specialists in those fields regularly object to the translation. There is no agreed replacement term.
What would resolve this A sustained comparative study working from each tradition's own vocabulary outward rather than from the English word inward, and testing whether any set of features is genuinely shared across them.
OpenComparative religion; religious studiesJohn Bowker (ed.), The Oxford Dictionary of World Religions