From Longman Dictionary of Contemporary Englishspellerspel‧ler /ˈspelə $ -ər/ noun → good/bad/poor etc speller
Examples from the Corpus
speller• Katie Ward was one of 33 spellers making their second appearance at the National Spelling Bee.• They give the good speller a chance to use his skill, but may depress a poor speller.• When the bee resumes Thursday, Ward will battle 102 other spellers until a new champion is crowned.• But the two other spellers, Guey and Dowdy, also missed their words.• Six spellers are competing for the third time and two for the fourth.• The great advantage of the Word-Maker is that the word can be corrected without confusing the speller by crossings out and insertions. 