Nigger. Nigga. Neither.: WORDS HAVE MEANING

NIGGER

In contemporary English language, nigger is an ethnic slur, usually directed at black people by non-black people. The word originated as a neutral term referring to people with black skin, as a variation of the Spanish/Portuguese noun negro, a descendant of the Latin adjective niger (“black”). It was often used disparagingly, and by the mid-twentieth century, particularly in the United States, its usage became unambiguously pejorative, a racist insult. Accordingly, it began to disappear from popular culture, and its continued inclusion in classic works of literature has sparked controversy. 

In the contemporary United States, using the word is taboo, and it is often replaced with the euphemism “the N-word”. “Nigga” is sometimes used among African Americans as a neutral or term of endearment. SOURCE

NIGGA

Nigga (/ˈnɪɡə/, pronounced identically to nigger in some dialects) is a colloquial term used in Black English Vernacular that began as an eye dialect form of the word nigger (a word originated as a term used in a neutral context to refer to black people, as a variation of the Spanish/Portuguese noun negro, a descendant of the Latin adjective niger, meaning the color “black”). SOURCE

NEITHER