ὁμόφωνος
From LSJ
ἐὰν ταῖς γλώσσαις τῶν ἀνθρώπων λαλῶ καὶ τῶν ἀγγέλων, ἀγάπην δὲ μὴ ἔχω, γέγονα χαλκὸς ἠχῶν ἢ κύμβαλον ἀλαλάζον → though I speak with the tongues of men and of angels and have not charity I am become as sounding brass or a tinkling cymbal
English (LSJ)
ον,
A speaking the same language with, ἔθνεα οὐκ ὁ. σφίσι (= ἀλλήλοις) Hdt.3.98, cf. Th.4.3, X.Mem.4.4.19. II of the same sound or tone, in unison with, τισι A.Ag.158(lyr.). Adv. -νως having the same name with, τινι Str.9.2.29. 2 in Music, on the same note, in unison, opp. σύμφωνος (in concord), Arist.Pr.921a7, al., Nicom.Harm.11.5, Ptol.Harm.1.7. Adv. -νως with one voice (accord), Plu.Galb.5, S.E.P.3.239. 3 Gramm., having the same sound (e.g. of voc. and nom. πόλις), Hdn. Gr.2.628.