A Vagrant

1. (dated) A person who wanders from place to place; a nomad, a wanderer.

Synonyms: itinerant, rover; wanderer

2. (specifically) A person without settled employment or habitation who supports himself or herself by begging or some dishonest means; a tramp, a vagabond.

Synonyms: drifter, hobo; vagabond

3. Vagrans egista, a widely distributed Asian butterfly of the family Nymphalidae.
4. (biology, especially ornithology) An animal, typically a bird, found outside its species' usual range.