This paper aims at investigating the vocabulary of thingness in the thought of Henry of Ghent. The paper features two main parts: in the first part we try to clarify the statement and the implications of the distinction between the concept of res a reor, reris and the concept of res a ratitudine. On the subject the thesis argued that this distinction has essentially an epistemological function in Henry of Ghent's thought. The second part of the paper, instead, takes into (...) consideration the concept of realitas as it is formulated by Henry in some sections of his Quodlibeta. The argued thesis is that realitas is not a synonym of being, but rather designates the inner foundation of every ontological attribution. (shrink)