Can someone help me with English please The Nightingale Pledge and The Hippocratic Oath what does it mean, why is it important, what are you taking away from it.

Throughout the giver, author lois lowry renames many everyday terms. eleven-year-olds are "elevens," babies are "newchildren," stuffed animals are "comfort objects," and families are called "family units." what is the purpose of these alternate labels? what effect do they have on the story?