It's an adjective. Your sentence is natural, casual English. Many adjectives can be used this way, eg I like happy better than sad .
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Hans51What do you native English speakers think?I would explain it like this. For the purposes of their conversation the speakers are accepting an ad hoc definition of 'real' as a noun meaning "the quality/property of being real" — in other words, "realness".
Hans51A : How can you tell real from imitation?By definition, "real" is not a noun. However, in conversations such as your sentence, it is sometimes possible. That said, it doesn't necessarily mean it will satisfy the grammar rules. Without extended context, this is correct: