Dedener or Deadener: How To spell?

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

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

You might be interested to know

Dethblow or Deathblow?

Disagreebly or Disagreeably?

Downherted or Downhearted?