19 Moby Thesaurus words for "good bye": Godspeed, adieu, aloha, conge, departing, doch-an-dorrach, farewell, leave, leave-taking, leavetaking, parting, parting words, send-off, stirrup cup, valediction, valedictorian, valedictory, valedictory address, viaticum

Source: Moby Thesaurus II by Grady Ward, 1.0