20. Of the aorist stems noticed in § 13, several are probably derived from nouns, and do not differ in formation from the presents discussed in the preceding section.
ἐ-γήρα (γῆρα-ς)
βιώ-τω (βίο-ς)
ἐπ-έπλω-ς (πλόο-ς)
ἁλῶ-ναι
Also, perhaps, ἀπ-όνη-το. Regarding the passive aorists, see §§ 42-44.