Final answer:
The word 'growl' is used to signify a non-verbal expression in both excerpts, first as an expression of annoyance and second as a playful acknowledgment of a kind act.
Step-by-step explanation:
In both excerpts from the provided texts, the word growl is used to convey a character's non-verbal expression of discomfort or dissatisfaction. In Excerpt 1, the growl is described as a reaction to physical pain or annoyance, as the man referred to as the 'ogre' growls when another man accidentally steps on his toe. His reaction is non-verbal and serves to express his displeasure, yet he doesn't actively engage or confront the person who caused him discomfort, keeping his eyes on his newspaper. In contrast, in Excerpt 2, the growl seems to be more of a playful or approving acknowledgment of a commendable action by a boy who offers his seat to a woman with a baby. This time, the growl is followed by the man's verbal action, where he commends the boy and assists the woman, indicating a shift from displeasure to a warm gesture.