A fortification is a noun that means “something that protects.”
The noun is intended to show the name of an object and is used to refer to things, people, places, and beings in general. The verb is not intended to name something, but to show an action.
So when the word means "To protect" we can see that the word refers to an action and therefore is a verb, but when the word means "something that protects" it means that this is the name of something.
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