The word Ceruleun is misspelled against Cerulean, an adjective meaning "Sky-colored; blue; azure."
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Cerulean has vowels 'ea' together mispronounced as 'eu'
Word contains consecutive vowels 'EA' in between alphabets cerul & n is misspelled as 'EU'
Wrong Spelling:  cerul-eu-n 
Correct Spelling:  cerul-ea-n 
Check more misspelled words of Cerulean to spell it correct.