* -al: Means "relating to" or "characteristic of". Example: national (relating to a nation)
* -wide: Means "extending across the whole nation". Example: nationwide (covering the entire country)
* -hood: Means "the state or quality of being a nation". Example: nationhood (the status of being an independent nation)
* -less: Means "without a nation". Example: nationless (not belonging to any nation)
* -ism: Means "a doctrine, belief, or system of thought". Example: nationalism (a belief in the importance of one's own nation)
* -ality: Means "the quality or state of being a nation". Example: nationality (the status of belonging to a particular nation)
You can also use "nation" as part of a compound word:
* nation-state: A sovereign state, typically associated with a particular nation.
* nation-building: The process of developing a national identity and institutions.
The specific suffix you choose will depend on the meaning you want to convey.