Stothman or Staithman: How To spell?

The word Stothman is misspelled against Staithman, a noun meaning "A man employed in weighing and shipping at a staith."

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

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