Pleon or Plain: How To spell?

The word Pleon is misspelled against Plain, an adjective meaning "A field of battle."

Word contains consecutive vowels 'AI' in between alphabets pl & n is misspelled as 'EO'
Wrong Spelling:  pl-eo-n 
Correct Spelling:  pl-ai-n 
Find more incorrect spellings of Plain to spell right way.

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