There are a number of nouns formed by prepending само to the action that that thing does that are very common: самолет, самовар. Other similar formations, like самодвижущийся, are uncommon.
Are there other examples of this pattern where a synonym with this prefix exists, but is not the most common way to refer to a noun? Is there any distinction that can be drawn between types of nouns that prefer the само-prefixed synonym over those that don't (assuming both exist)?