gnawed / nod [nɒd]
gnawed – v. – simple past and past participle of gnaw – 1. chewed; 2. worn away by small bites or pieces; 3. corroded, wasted away, consumed
nod – n. & v. – n. – 1. an up and down movement of the head indicating assent or drowsiness; 2. this motion to give an order; 3. a simpleton; 4. back of the neck; v. – 1. bow the head to give assent, greeting or command; 2. involuntarily let the head fall forward especially when sleepy