Related by context. Frequent words. (Click for all words.) 64 rudimentary 56 prehistoric 55 archaic 52 modern 52 primordial 52 Neanderthal 51 Stone Age 51 ancient 48 Homo sapiens 48 uncivilized 48 proto 47 caveman 46 barbarous 45 primal 45 humans 45 cavemen 45 barbaric 44 antiquated 44 warlike 44 outmoded 44 civilization 44 utilitarian 44 anachronistic 44 Dark Ages 43 Bronze Age 43 ancestors 43 Neolithic 43 Darwinian 43 anthropological 43 medieval 43 fossilized 43 spartan 42 civilized 42 evolutionary 42 Neanderthals 42 indoor plumbing 42 arrowheads 41 infantile 41 nomadic 41 ancient Greeks 41 sophisticated 41 old fashioned 41 savages 41 modern conveniences 41 flint 40 clunky 40 mechanized 40 old timey 40 millennia 40 forebears 40 modernity 40 Middle Ages 40 Iron Age 40 olden days 40 rough hewn 40 unsophisticated 39 domesticated 39 dinosaurs 39 newfangled 39 naturalistic 39 mystical 39 basic 39 elemental 39 futuristic 39 vertebrate 39 antiquity 39 rustic 39 pre Columbian 39 untamed 39 skeletal 39 apes 38 yore 38 extant 38 quaint 38 inhabited 38 egalitarian 38 bygone era 38 hardwired 38 simplistic 38 barbarian 38 nineteenth century 38 cannibalism 38 feudal 38 shaman 38 haphazard 38 human 38 instinctual 38 Native Americans 38 pagan 38 reptilian 38 poorly understood 38 inhospitable 38 eons 38 esoteric 37 outdated 37 backwoods 37 vertebrates 37 humanoid 37 aberrant 37 traditional 37 locomotion