The word Quarteron is misspelled against Quarteroon, a noun meaning "A quadroon."
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Quarteroon has double "oo" is mispronounced as "o"
Remember double 'OO' in between the strings quarter & n which should not be misspelled with single 'O'
Wrong Spelling:  quarter-o-n 
Correct Spelling:  quarter-oo-n 
Check more misspelled words of Quarteroon to spell it correct.