MyVocabulary.com offers 14 PREFIX puzzles with the grade level of each word marked to the right of the word beginning with a prefix. Use eight grade level words for each prefix. "AD" prefix words: Adequate - 7, Adhere - 8, Adjourned - 8, Admission - 6, Admonish - HS, Adventurous - 5, Adversity - 8, Advocate - 7