Deydener or Deadener: How To spell?

The word Deydener is misspelled against Deadener, a noun meaning "One who, or that which, deadens or checks."

Deadener has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets d & dener is misspelled as 'EY'
Wrong Spelling:  d-ey-dener 
Correct Spelling:  d-ea-dener 
Explore spell check of Deadener to spell without errors.

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