The word Hypogaun is misspelled against Hypogean, an adjective meaning "Hypogeous."
-->
Hypogean has vowels 'ea' together mispronounced as 'au'
Word contains consecutive vowels 'EA' in between alphabets hypog & n is misspelled as 'AU'
Wrong Spelling:  hypog-au-n 
Correct Spelling:  hypog-ea-n 
Check more misspelled words of Hypogean to spell it correct.