We don't have synonyms for schvartze yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are shvartze, schwartze and schwartz.
(n) :
(chiefly US, offensive, ethnic slur) Alternative form of shvartze. [(Jewish, US, now offensive, ethnic slur) A person of sub-Saharan African descent; a black person.]
(n) :
(chiefly US, offensive, ethnic slur) Alternative form of shvartze. [(Jewish, US, now offensive, ethnic slur) A person of sub-Saharan African descent; a black person.]