ὑπόληψις, opinion.
ὑπόστασις, basis, substance, being, foundation (x. 5). Epictetus has τὸ ὑποστατικὸν καὶ οὐσιῶδες. (Justinus ad Diogn. c. 2.)
ὑφίστασθαι, to subsist, to be.
φαντασίαι(visus, Cic.); appearances, thoughts, impressions (visa animi, Gellius, xix. 1): φαντασία ἐστὶ τύπωσις ἐν ψυχῄ.
φάντασμα, seems to be used by Antoninus in the same sense as φαντασία. Epictetus uses only φαντασία.
φανταστόν, that which produces a φαντασία: φανταστὸν τὸ τεπσιηκὸς τὴν φαντασίαν αίσθητόν.
φύσις, nature.
φύσις ἡ τῶν ὄλων, the nature of the universe.
ψυχή, soul, life, living principle.
ψυχὴ λογική, νοερά, a rational soul, an intelligent soul