--> Subperiosteal has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets subperiost & l is misspelled as 'EY'
Wrong Spelling:  subperiost-ey-l 
Correct Spelling:  subperiost-ea-l 
Check more misspelled words of Subperiosteal to spell it correct.