Synonyms for Swan (same or very similar meaning)
WordNet sense 1 (move about aimlessly or without any destination, often in search of food or employment):
cast, drift, ramble, range, roam, roll, rove, stray, tramp, vagabond, wanderWordNet sense 2 (to declare or affirm solemnly and formally as true):
affirm, assert, aver, avow, swear, verifyFrom the ODE community, based on WordNetadd/edit