αἰγάς

From LSJ

ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)

Source

Spanish (DGE)

-άδος, ἡ cabra Epich.137, αἰγάδας· αἶγας. Δωριεῖς Hsch.