Exactly what kind of a noun is "language" in this metaphorical sentence?
Music is beautiful language.
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"Language" is a common abstract noun. An abstract noun is, to put it simply, a thing which cannot be touched; a noun which expresses an idea, quality or state rather than a physical object. (Paraphrased from Google)
The other type of common noun is the concrete noun. This is the noun which is most common; for example, "dog", "computer", "table". Common nouns do not require a capital letter except in obvious circumstances such as the beginning of a sentence.