In the arts, is there a sort of plagiarism that is not technically copyright infringement but is still wrong?

My using this image is copyright infringement, but is it plagiarism?

In our workshop, we've been reading through The Best American Stories 2013, and a spirited discussion begun over Lorrie Moore's story "Referential," which (among other things) is a commentary on Nabokov's "Signs and Symbols." I thought that the story was brilliant, but a good portion o…