There are two different senses in which we use the word "attribute"; for example, I can describe someone as "blond", which is a hair color. We say "blond" is a characteristic or attribute, but it is clearly the characteristic or attribute with regards to the characteristic or attribute "hair color" - "blond" is not how they smell or how tall they are, it's one of a set of attributes that fall under the attribute "hair color".
I have called both "blond" and "hair color" with the same word, "attribute", here, and, as far as I know, all the popular synonyms of "attribute" really are synonyms - "characteristic", "trait", "property", etc.
Is there any way or term or expression to verbalize the difference between an attribute in the sense of what it is - in this case, a person really being blond - and an attribute in the sense of what "category" that attribute belongs to - in this case, blond being a hair color?
To put it another way, for the sentence "For the attribute "hair color", he has the attribute "blond".", I would like to find a different word for one or both of the uses of "attribute" here, so that the words used unambiguously convey that one is the actual attribute (blond), and the other is the "category of attributes" (hair color).