Answer:
definitions are in order of your list
1. a sovereign state whose citizens or subjects are relatively homogeneous in factors such as language or common descent
2. stateless nation is an ethnic group or nation that does not possess its own state and is not the majority population in any nation state
3. country with more than 1 nation or ethnicity.
4. is a proposed approach to resolving the Israeli–Palestinian conflict
5. multinational state is a sovereign state that comprises two or more nations or states. This contrasts a nation state, where a single nation accounts for the bulk of the population.
6. policy of advocating the restoration to a country of any territory formerly belonging to it.
7. part of a state that is geographically separated from the main part by the territory of one or more states.
8.enclave is a territory that is entirely surrounded by the territory of one other state. Enclaves may also exist within territorial waters.