migrant

errant, fugitive, itinerant, nomadic, peregrine, peripatetic, ranging, roaming, roving, traveling (or travelling), vagabond, vagrant, wandering, wayfaring

ambulant, ambulatory, drifting, fiddle-footed, footloose, gadabout, gallivanting (also galavanting), meandering, rambling, sauntering, strolling, traipsing

defector, deportee, evacuee, exile, expatriate, refugee, relocatee, repatriate

alien, foreigner, illegal, noncitizen, nonnative

colonist, newcomer, squatter

migrator, pilgrim, pioneer, trekker