Assalter or Assaulter: How To spell?

The word Assalter is misspelled against Assaulter, a noun meaning "One who assaults, or violently attacks; an assailant."

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

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