These are the same 26 words from our vocab quiz. This packet has students defining the word, finding its use in the book, and using the word in a sentence. Make it yourself after downloading the quiz or use this one and save trying to find all the words throughout the book.
The only thing we can't guarantee is that every copy of A Separate Peace has the same page numbers. My school had the same as my wife's, but I do not have a copy of either book right now. You can check with one of the words: if you can find "Disconcerting" on page 192, I bet it's a match.