νῖκος
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
εος, τό, later form for νίκη, LXX 1 Es.3.9, BGU1002.14 (i B.C.), IG12 (5).764.2 (Andros, prob. i A.D.; written νεῖκος), Ev.Matt.12.20, Vett.Val.358.5, Orph.A.587, APl.5.381, read by Aristarch. in Il.12.276;
A εἰς νῖκος for ever, LXX 2 Ki.2.26, al.
German (Pape)
[Seite 257] τό, = νίκη, Sp., wie Polem. 1, 12; Theocr. 22, 129; vgl. Lob. Phryn. 647. Aber Aesch. Suppl. 929 ist nicht hierher zu ziehen.
Greek (Liddell-Scott)
νῖκος: τό, μεταγενέστ. τύπος τοῦ νίκη, Ὀρφ. Ἀργ. 585, Ἀνθ. Πλαν. 381, κτλ.