Dreoner or Drainer: How To spell?

The word Dreoner is misspelled against Drainer, a noun meaning "One who, or that which, drains."

Word contains consecutive vowels 'AI' in between alphabets dr & ner is misspelled as 'EO'
Wrong Spelling:  dr-eo-ner 
Correct Spelling:  dr-ai-ner 
Find more incorrect spellings of Drainer to spell right way.

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