strays — to deviate from the direct course, leave the proper place, or go beyond the proper limits, especially without a fixed course or purpose; ramble: to stray from the main road.
immigrants — a person who migrates to another country, usually for permanent residence.
gypsies — a member of a nomadic, Caucasoid people of generally swarthy complexion, who migrated originally from India, settling in various parts of Asia, Europe, and, most recently, North America.
nomads — a member of a people or tribe that has no permanent abode but moves about from place to place, usually seasonally and often following a traditional route or circuit according to the state of the pasturage or food supply.