Kafir has 4 different meanings across 2 categories:
Noun · Proper Noun
an offensive and insulting term for any Black African
a member of the Kafir people in northeastern Afghanistan
A disbeliever, a denier: someone who rejects or disbelieves in God as per Islam (Arabic: الله Allāh) or the tenets of Islam; or more broadly any non-Muslim.
The Nuristani language family.