I use these cards in my classroom as flashcards. Each page is copied onto a different color cardstock, laminated and put on a ring.
They are a companion with my Fry Word Sticker book. It also matches the Fry Word list by Bitsboard PRO using the free iPad app, Bitsboard. (You do not need to purchase the Bitboard PRO app you can use the free version)
They can also be used as word wall cards.