Lethoenize or Letheonize: How To spell?

The word Lethoenize is misspelled against Letheonize, a verb meaning "To subject to the influence of letheon."

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