The word Decreeyble is misspelled against Decreeable, an adjective meaning "Capable of being decreed."
-->
Decreeable has vowels 'ea' together mispronounced as 'ey'
Word contains consecutive vowels 'EA' in between alphabets decre & ble is misspelled as 'EY'
Wrong Spelling:  decre-ey-ble 
Correct Spelling:  decre-ea-ble 
Explore spell check of Decreeable to spell without errors.