The word Dunderhaed is misspelled against Dunderhead, a noun meaning "A dunce; a numskull; a blockhead."
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Dunderhead has vowels 'ea' together mispronounced as 'ae'
Word contains consecutive vowels 'EA' in between alphabets dunderh & d is misspelled as 'AE'
Wrong Spelling:  dunderh-ae-d 
Correct Spelling:  dunderh-ea-d 
Check more misspelled words of Dunderhead to spell it correct.