According to Davidson, a sentence like Brutus stabbed Caesar can be represented as ∃e.stab(Brutus,Caesar), where e is a reified event. Is there a term for something that's not an event? I first thought of "entity" or "individual" but both terms are used in some ontologies for everything including events.
Davidson used alternatively the terms substance or object for this basic kind of entities.
Many events are changes in a substance. If an event a is a change in some substance, then a = b only if b is also a change in the same substance . . . But it would be a mistake to suppose that even for events that are naturally described as changes in an object, we must describe them . . . by referring to the object. ("The Individuation of Events")
Another (non Davidsonian) terminological option is to speak about spatial particulars or individuals (=substances) vs. temporal particulars (=events).
Persons are regarded in many ontologies as just substances (e.g. in Aristotle) or objects (as in Davidson). But there are also exceptions. Kant stressed the difference between subject and object, although in his system the term subject is not ontological. Heidegger posited the person as a special kind of entity. His ontological term is Dasein i.e. being-there. Sartre posited a similar ontological category for persons, and adopted for it Hegel's term being-for-itself).