Music: "Bayer" or John Mayer's Room for Squares
Book: "Moon" or Goodnight Moon
Past time: "Papa! Appie! Bus! Car!" or Sitting outside Grandpa's house watching airplanes, the Orbit, and cars go by.
Food: "Ceral" or Oatmeal
Toy: "Puzle" or Alphabet puzzle and letter flashcards
Color: "Purpo" or I think it is because it is the only color he consistently identifies properly