Roser or Raiser: How To spell?

The word Roser is misspelled against Raiser, a noun meaning "One who, or that which, raises (in various senses of the verb)."

Word contains consecutive vowels 'AI' in between alphabets r & ser is misspelled as 'O'
Wrong Spelling:  r-o-ser 
Correct Spelling:  r-ai-ser 
Find more incorrect spellings of Raiser to spell right way.

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