Subtenant

(n.) One who rents a tenement, or land, etc., of one who is also a tenant; an undertenant.

Thesaurus Entries

colonial, colonist, colonizer, hirer, immigrant, incumbent, leaseholder, lessee, lodger, nester, occupant, occupier, paying guest, pioneer, planter, precursor, renter, resident, roomer, settler, sooner, squatter, sublessee, subtenant, tenant, tenant at sufferance, tenant for life, underlessee