Twean or Twain: How To spell?

The word Twean is misspelled against Twain, an adjective meaning "Two; -- nearly obsolete in common discourse, but used in poetry and burlesque."

Word contains consecutive vowels 'AI' in between alphabets tw & n is misspelled as 'EA'
Wrong Spelling:  tw-ea-n 
Correct Spelling:  tw-ai-n 
Explore spell check of Twain to spell without errors.

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