The word Hardihead is misspelled against Harddihead, a noun meaning "Hardihood."
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Harddihead has double "dd" is mispronounced as "d"
Remember double 'DD' in between the strings Har & ihead which should not be misspelled with single 'D'
Wrong Spelling:  Har-d-ihead 
Correct Spelling:  Har-dd-ihead 
Find more wrongly spelled words of Harddihead to spell it well.