ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
ὁμόστολος, ὁμότροπος, κοινός, ὁμός, ἴσος, ἶσος, ἔϊσος, ἰσόμαχος, ἰσοζυγής, ἀντίπλαστος, ἀντίπαλος