The word Hypogeyn is misspelled against Hypogean, an adjective meaning "Hypogeous."
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Hypogean has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets hypog & n is misspelled as 'EY'
Wrong Spelling:  hypog-ey-n 
Correct Spelling:  hypog-ea-n 
Find more incorrect spellings of Hypogean to spell right way.