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