The Collaborative International Dictionary of English v.0.48:

Roomer \Room"er\, n.
   A lodger. [Colloq.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Roomer \Room"er\, adv. [See Room, a.]
   At a greater distance; farther off. [Obs.] --Sir J.
   Harrington.
   [1913 Webster]

WordNet (r) 3.0 (2006):

roomer
    n 1: a tenant in someone's house [syn: lodger, boarder,
         roomer]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "roomer":
   board-and-roomer, boarder, hirer, homesteader, incumbent,
   leaseholder, lessee, lodger, occupant, occupier, paying guest,
   renter, resident, squatter, sublessee, subtenant, tenant,
   tenant at sufferance, tenant for life, transient, transient guest,
   underlessee