What are the following words called: Am, Is, Are, Was, Were, Be, Being, Been?

Kiamlaluno’s answer is the closest to my understanding – And though mfg mentions Heidegger, Plato and Aristotle were the source of original Ontological dialogues of being qua being. “I am that you were.” states tenses of the abstract qualities of being. The sentence is awkward and seems to be too truncated, but it is actually has correct usage of the ‘being’ tenses reflected in both ‘am’ and ‘were’. The distinction reads as, “I am (present reference being) that you were (past reference being). With this distinction, Am, Is, Are, Was, Were, Be, Being, Been can be considered as referential verbs. In context; referential Referential / Reference is a relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to refer to the second object.”