The word Decreised is misspelled against Decreased, which is past tense of "Decrease"
-->
Decreased has vowels 'ea' together mispronounced as 'ei'
Word contains consecutive vowels 'EA' in between alphabets decr & sed is misspelled as 'EI'
Wrong Spelling:  decr-ei-sed 
Correct Spelling:  decr-ea-sed 
Find more wrongly spelled words of Decreased to spell it well.