I know that Terror is a noun, but is there a name for a noun that's used to describe another noun like this?
I don't think 'Terror' describes the tomb. It tells you what the tomb contains. Similarly, in 'a bucket of water', water does not describe the bucket. Now, a 'water bucket' would be a bucket whose purpose is solely to hold water. Water now describes the type of bucket. Similarly 'a green bucket' - green describes the bucket. So your example would be 'a terror tomb' to describe the type of tomb it is. Here, 'water', 'green' and 'terror' are adjectives describing a noun. In your example, 'terror' is simply a noun - it is the name of a thing, albeit an abstract thing, that is contained within another thing.
A noun that's used to describe another noun is called an adjective.
protected by tchrist♦ Dec 19 '14 at 4:49
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