This is the Thanksgiving version of a popular worksheet series. (Look for What is it? for the original version) The common core standard is for 1st grade but I believe grades 2 and 3 would enjoy this holiday activity.
This series of worksheets assist students with defining words by category and attributes. Students use a table to answer questions about common items in a category. Then they are asked to write a definition for the items based on the answers in the table. The difficulty for this skill is progressive. This is an excellent cooperative learning activity.