Exhaster or Exhauster: How To spell?

The word Exhaster is misspelled against Exhauster, a noun meaning "One who, or that which, exhausts or draws out."

Word contains consecutive vowels 'AU' in between alphabets exh & ster is misspelled as 'A' as letter 'U' is phonetically ignore
Wrong Spelling: exh-a-ster
Correct Spelling: exh-au-ster
Explore spell check of Exhauster to spell without errors.