Since the Latin language lacks a present active participle for the verb "to be," Tertullian and other Latin authors rendered the Greek noun "ousia" (being) as "substantia," and the Greek adjective "homoousios" (of the same being) as "consubstantialis".
It has also been noted that this Greek term "homoousian" or "consubstantial", which Athanasius of Alexandria favored, and was ratified in the Nicene Council and Creed, was actually a term reported to also be used and favored by the Sabellians in their Christology.