The Collaborative International Dictionary of English v.0.48:
Roamer \Roam"er\ (r[=o]m"[~e]r), n. One who roams; a wanderer. [1913 Webster]WordNet (r) 3.0 (2006):
roamer n 1: someone who leads a wandering unsettled life [syn: wanderer, roamer, rover, bird of passage]