Reification

Reification (also known as hypostatisation, concretism or The fallacy of misplaced concreteness) is a fallacy of ambiguity, when an abstraction (abstract belief or hypothetical construct) is treated as if it were a concrete, real event or physical entity. In other words, it is the error of treating as a "real thing" something which is not a real thing, but merely an idea. For example: when one person "holds another's affection", affection is being reified.