Correct spelling for the English word "swarts" is [swˈɔːts], [swˈɔːts], [s_w_ˈɔː_t_s] (IPA phonetic alphabet).
The word "swarts" is derived from Middle English "swart", which itself originated from Old English "sweart". In Old English, "sweart" meant "black" or "dark-colored", and it can be traced back to the Proto-Germanic word "swartaz". This term eventually gave rise to several related words in various Germanic languages, all describing something dark or black.