Heroen or Hereon: How To spell?

The word Heroen is misspelled against Hereon, an adverb meaning "On or upon this; hereupon."

Word contains consecutive vowels 'EO' in between alphabets her & n is misspelled as 'OE'
Wrong Spelling:  her-oe-n 
Correct Spelling:  her-eo-n 
Find more incorrect spellings of Hereon to spell right way.