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