The spelling words that drop a letter when adding the suffix –ion include confuse and decorate.
It should be noted that a suffix simply means a morpheme that's added at the end of a word to form a derivative.
In this case, the spelling words that drop a letter when adding the suffix –ion include confuse and decorate. The words become confusion and decoration.
Learn more about suffix on:
https://brainly.com/question/454788