Attentment or Attaintment: How To spell?

The word Attentment is misspelled against Attaintment, a noun meaning "Attainder; attainture; conviction."

Word contains consecutive vowels 'AI' in between alphabets att & ntment is misspelled as 'E'
Wrong Spelling:  att-e-ntment 
Correct Spelling:  att-ai-ntment 
Explore spell check of Attaintment to spell without errors.

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