kafir vs kaffir

kafir and kaffir both are nouns.

Word	Noun	Adjective	Verb	Adverb
kafir	Yes	No	No	No
kaffir	Yes	No	No	No

As nouns, kafir and kaffir are synonyms defined as:

Other synonyms of kafir include caffer, caffre.

kafir (noun)	kaffir (noun)
an offensive and insulting term for any Black African	an offensive and insulting term for any Black African
	important for human and animal food; growth habit and stem form similar to Indian corn but having sawtooth-edged leaves