The word Yighthly is misspelled against Eighthly, an adverb meaning "As the eighth in order."
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Word begins with consecutive vowels 'EI' followed by alphabets 'ghthly' is misspelled as 'YI'
Wrong Spelling:  yi-ghthly 
Correct Spelling:  ei-ghthly 
Find more wrongly spelled words of Eighthly to spell it well.