Depending on how you interpret Tolkien’s writing, there may be an isolated example of the primitive subjective. On SD/426, Tolkien gives two primitive words, ✶khāw and ✶khăw, both with the meaning “crow”. These could be variations on the same root, but a more interesting interpretation is that ✶khāw is the subjective form of ✶khăw, which would be the case if, like the Classical Adûnaic subjective, it was formed via a-fortification. As further evidence of this, its primitive plural ✶khāwī(m) looks like a subjective plural instead of an ordinary plural. Tolkien’s does not declare ✶khāw to be subjective, however, so this interpretation may not be correct.