The spelling of the word "hederman" can be explained phonetically as /ˈhɛdəmən/. The first syllable "hed" is pronounced with a short "e" sound and the "d" is followed by a schwa sound "ə". The second syllable "er" is pronounced with an "uh" sound and the "m" is followed by another schwa sound. The final syllable "an" is pronounced with a short "a" sound followed by an "n". So, the correct spelling of the word is "hederman" and it is pronounced as /ˈhɛdəmən/.