Coalition and Northern Alliance

Coalition noun - A group of people acting together within a larger group.

Northern Alliance and coalition are semantically related. In some cases you can replace phrase "Northern Alliance" with "Coalition", this terms are similar.

Northern Alliance noun - A multiethnic alliance in Afghanistan who practice a moderate form of Islam and are united in their opposition to the Taliban.

Coalition and Northern Alliance are semantically related. You can use "Coalition" instead a noun phrase "Northern Alliance".