From Longman Dictionary of Contemporary Englishgood/bad/poor etc spellergood/bad/poor etc spellersomeone who is good or bad at spelling words correctly words that confuse even good spellers → speller
Examples from the Corpus
good/bad/poor etc speller• Only good spellers can spell easily orally.• They give the good speller a chance to use his skill, but may depress a poor speller. 