The Collaborative International Dictionary of English v.0.48:

Occupant \Oc"cu*pant\, n. [L. occupans, p. pr. of occupare: cf.
   F. occupant. See Occupy.]
   1. One who occupies, or takes possession; one who has the
      actual use or possession, or is in possession, of a thing;
      as, the occupant of the apartment is not at home.
      [1913 Webster]

   Note: This word, in law, sometimes signifies one who takes
         the first possession of a thing that has no owner.
         [1913 Webster]

   2. A prostitute. [Obs.] --Marston.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "occupant":
   addressee, artist-in-residence, boarder, denizen, dweller,
   habitant, hirer, homesteader, house detective, householder,
   incumbent, inhabitant, inhabiter, inmate, inpatient, intern,
   leaseholder, lessee, live-in maid, liver, locum tenens, lodger,
   occupier, owner, paying guest, renter, residencer, resident,
   resident physician, residentiary, resider, roomer, sojourner,
   squatter, sublessee, subtenant, tenant, tenant at sufferance,
   tenant for life, underlessee