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What is the difference between nouns: wilderness and wild. If we refer to the film "Wild" with Reese Whitersoon, we might name it movie about self discovery in the wild or in the wilderness?
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Wild is mostly used as an adjective. There are a couple of expressions where it is a noun.

 "On this tour you can see native species in the wild." 

"in the wild" is an expression meaning in their unaltered natural environment.

Another expression is "in the wilds of Borneo" - The plural form is used in the particular expression to mean all the wilderness areas in a country, state, or other region..


WIlderness is always a noun. It means a specific area or region (usually covered in dense vegetation ) that has not been altered by human activities. It is a place where people do not live and cannot live. One can easily get lost in the wilderness.