κνάπτωρ
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
or γνάπτωρ, ορος, ὁ, poet. for κναφεύς, Man.4.422.
German (Pape)
[Seite 1459] ορος, ὁ, od. γνάπτωρ, Maneth. 4, 421, = κναφεύς.
Greek (Liddell-Scott)
κνάπτωρ: ἢ γνάπτωρ, ορος, ὁ, ποιητ. ἀντὶ τοῦ κανφεύς, Μανέθων 4. 422.