An anagram is a word formed by rearranging all the letters of another word, using each letter exactly once. These words use every letter from "ANETGRA":
Any one of numerous species of bright-colored singing birds belonging to Tanagra, Piranga, and allied genera. The scarlet tanager (Piranga erythromelas) and the summer redbird (Piranga rubra) are common species of the United States.