Explanation:

- Ethnicity: Refers to shared cultural traits, race, language, or nation. It's about identity related to specific groups.

- Ethnocentrism: This is the belief that one's own group is superior to others. It's about judging other cultures by the standards of one's own.

- Ethnic group: A community with shared characteristics such as culture and language. It's more about group identity, not necessarily about superiority.

- Ego-centrism: When a person centers everything around themselves, not related to groups or culture.