nigga vs nigger

nigga and nigger both are nouns.

Word	Noun	Adjective	Verb	Adverb
nigga	Yes	No	No	No
nigger	Yes	No	No	No

As nouns, nigga and nigger are synonyms defined as:

nigga and nigger: (ethnic slur) extremely offensive name for a Black person

Other synonyms of nigga include jigaboo, nigra.

nigga (noun)	nigger (noun)
(ethnic slur) extremely offensive name for a Black person	(ethnic slur) extremely offensive name for a Black person