οὐσιοποιός
From LSJ
ἔκστασίς τίς ἐστιν ἐν τῇ γενέσει τὸ παρὰ φύσιν τοῦ κατὰ φύσιν → what is contrary to nature is any developmental aberration from what is in accord with nature (Aristotle, On the Heavens 286a19)
English (LSJ)
όν,
A creating substance or essence, Herm.in Phdr. p.153 A., Procl.Inst.157, Dam.Pr.83, Simp.in Cat.325.20, etc.