if something has the role of something else then that something is an example of that something else
else is river. persons is not synonym_for_people. change is when_one_thing_becomes_another_thing. anything_else is film. space is what_between_else. person is individual_unlike_other. space is not what_between_else. people is synonym_for_persons. persons is synonym_for_people. person is not individual_unlike_other.