Certeyn or Certain: How To spell?

The word Certeyn is misspelled against Certain, a noun meaning "A certain number or quantity."

Word contains consecutive vowels 'AI' in between alphabets cert & n is misspelled as 'EY'
Wrong Spelling:  cert-ey-n 
Correct Spelling:  cert-ai-n 
Explore spell check of Certain to spell without errors.

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