ῥεῖα
From LSJ
ἀρχὴ παιδεύσεως ἡ τῶν ὀνομάτων ἐπίσκεψις → the beginning of education is the examination of names, the beginning of philosophical education is the examination of names, the beginning of all education is the investigation of names
English (LSJ)
Ep. for ῥέα, ῥᾶ (qq. v.), (sts. elided, Il.15.356, Od.17.273), Adv. of ῥᾴδιος,
A easily, lightly, freq. in Hom. (v. infr.) and Hes. (Op.6, al., but ῥέα ib.5); θεοὶ ῥεῖα ζώοντες the gods who live at ease, Il.6.138, Od.4.805; τούτοισιν μὲν ταῦτα μέλει, κίθαρις καὶ ἀοιδή, ῥεῖα lightly, pleasantly, 1.160; strengthd. ῥεῖα μάλ' Il.3.381, 15.362, etc.; ὡς ῥεῖα κυβιστᾷ easily, deftly, 16.745, cf. 749.