There are 5 Challenge Words each week in addition to the 20 spelling words that can be found in the Reader's and Writer's Notebook...
Challenge Words
Week 1: The Fabulous Perpetual Motion Machine
rehearsal
salamander
prominent
significant
parakeet
Week 2: Leonardo's Horse
sledgehammer
brokenhearted
chalkboard
straightforward
granddaughter
Week 3: The Dinosaurs of Waterhouse Hawkins
extraordinary
reminisce
acknowledge
prejudice
allergic
Week 4: Mahalia Jackson
silhouette
millionaire
dilemma
embarrassment
compassionate
Week 5: Special Effects in Film and Television
unnecessary
disobedient
dehumidifier
disinfectant
disenchanted