Accent
People speaking the same language do have different accents. Even people in the same country may have different accents.  Sometimes people can tell what city someone lived in when they were a child by the way that person speaks. One example is a New York City accent. They might say "bwoll" () instead of ball (normally  in America), like used in sports and games; or they might say "hwot dwog" () instead of hot dog (normally  or  in that country). It sounds different, but people still know they mean "ball" or "hot dog" when they're talking.