The Collaborative International Dictionary of English v.0.48:

Theist \The"ist\, n. [Cf. F. th['e]iste. See Theism.]
   One who believes in the existence of a God; especially, one
   who believes in a personal God; -- opposed to atheist.
   [1913 Webster] Theistic

The Collaborative International Dictionary of English v.0.48:

Deist \De"ist\ (d[=e]"[i^]st), n. [L. deus god: cf. F.
   d['e]iste. See Deity.]
   One who believes in the existence of a God, but denies
   revealed religion; a freethinker.
   [1913 Webster]

   Note: A deist, as denying a revelation, is opposed to a
         Christian; as, opposed to the denier of a God, whether
         atheist or pantheist, a deist is generally
         denominated theist. --Latham.

   Syn: See Infidel. Deistic

WordNet (r) 3.0 (2006):

theist
    adj 1: of or relating to theism [syn: theist, theistical,
           theistic]
    n 1: one who believes in the existence of a god or gods

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "theist":
   Christian, God-fearing man, accepter, allotheist, anthropolater,
   anthropotheist, autotheist, believer, catechumen, churchgoer,
   churchite, churchman, communicant, convert, cosmotheist,
   daily communicant, deist, devotee, devotionalist, disciple,
   ditheist, dualist, fanatic, follower, good Christian, henotheist,
   hylotheist, monotheist, multitheist, myriotheist, neophyte,
   pantheist, physitheist, pietist, polytheist, proselyte,
   psychotheist, receiver, religionist, saint, tetratheist,
   theriotheist, tritheist, truster, votary, zealot, zootheist