The word Decreaible is misspelled against Decreeable, an adjective meaning "Capable of being decreed."
-->
Decreeable has vowels 'ea' together mispronounced as 'ai'
Word contains consecutive vowels 'EA' in between alphabets decre & ble is misspelled as 'AI'
Wrong Spelling:  decre-ai-ble 
Correct Spelling:  decre-ea-ble 
Find more wrongly spelled words of Decreeable to spell it well.