BT Ber 53b(32) :יונה דדהבא‏ : a dove of gold
See the entire entry for yaw/ōn, yaw/ōnā n.f. dove

BT Ber 53b(32) :משום דמתילא כנסת ישראל ליונה‏ : because the community of Israel is likened to a dove
See the entire entry for mtl vb. to compare