[1] : WordNet (r) 2.0

caveman
     n : someone who dwells in a cave syn: cave man, cave dweller,
          troglodyte
see also:
cave man cave dweller troglodyte 

[2] : Moby Thesaurus II by Grady Ward, 1.0

29 moby thesaurus words for "caveman":
   bronze age man, hominidae, iron age man, stone age man, aboriginal,
   aborigine, ancient, antediluvian, anthropoid, ape-man, autochthon,
   bucko, bushman, cave dweller, fossil man, he-man, hominid,
   humanoid, jock, jockstrap, man of old, missing link, preadamite,
   prehistoric man, prehuman, primate, primitive, protohuman,
   troglodyte

Caveman >> C Words
Caveman, definition of term: Caveman
caveman_pag1.html