a person's face or facial expression.
Names a particular person, place, thing, or idea. They are words which name specific people, organisations or places. They always start with a capital letter. E.g. the Civil War, Monday, or Potter.
Both Napoleon and Snowball definitely want the the farm run by animals by getting rid of Mr. Johns and they both are instrumental in spreading Animalism. But they are also different, Snowball wants animals to work together and run the farm, while Napoleon is more totalitarian and eventually usurps power.