Term for the different uses of "are": one which applies an adjective independently, and one which denotes a relationship
There are definitely at least two ways in which the word "are" is used. Consider the following:
Book A and Book B are red.
vs
Book A and Book B are similar.
In the first use, it is applying an adjective independently to multiple objects. You can view it as syntactic sugar for
Book A is red and Book B is red.
However, the second sentence doesn't allow such an expansion.
Now, I come from a CS and math background, so my view of this is a bit theoretical (to me, it seems that there is a difference in composition between the two example sentences). Grammatically or linguistically, is there such a concept as the difference I have described?
[1] Book A and Book B are red.
[2] Book A and Book B are similar.
Yes, there is a difference.
Example [1] is called distributive coordination, while [2] is called joint coordination.
In [1] the property of being red applies to book A and book B separately -- it is distributed between them; whereas in [2] the property of being similar applies to the two books jointly, as a group.