Retuner or Retainer: How To spell?

The word Retuner is misspelled against Retainer, a noun meaning "A fee paid to engage a lawyer or counselor to maintain a cause, or to prevent his being employed by the opposing party in the case; -- called also retaining fee."

Word contains consecutive vowels 'AI' in between alphabets ret & ner is misspelled as 'U'
Wrong Spelling: ret-u-ner
Correct Spelling: ret-ai-ner
Check more misspelled words of Retainer to spell it correct.