Lodger

(n.) One who, or that which, lodges; one who occupies a hired room in another's house.

Thesaurus Entries

board-and-roomer, boarder, hirer, homesteader, incumbent, leaseholder, lessee, occupant, occupier, paying guest, renter, resident, roomer, squatter, sublessee, subtenant, tenant, tenant at sufferance, tenant for life, transient, transient guest, underlessee