Related by context. Frequent words. (Click for all words.) 56 dinosaurs 49 tyrannosaurus rex 49 Cretaceous Period 47 supercontinent 47 Pleistocene era 47 prehistoric creatures 46 Mental Floss 45 dinos 45 trilobites 45 brontosaurus 45 feathered dinosaurs 45 marine reptiles 45 tyrannosaurs 45 Inca empire 45 cavemen 45 flightless 44 prehistoric 44 Mammoths 44 megafauna 44 homo sapiens 44 Fertile Crescent 44 woolly mammoths 43 primordial ooze 43 H. erectus 43 dinosaur 43 Burgess Shale 43 pterodactyls 43 triceratops 43 interbred 43 African savanna 43 Mesozoic 42 Longrich 42 extinct 42 sauropods 42 thylacine 42 theropod 42 Beringia 42 mastodons 42 Cambrian explosion 42 Sumerians 42 carnivorous dinosaurs 42 wooly mammoth 42 dino 42 single celled organisms 42 dinosaurs roamed 42 hadrosaur 41 Pleistocene 41 snakes lizards 41 Stegosaurus 41 Late Cretaceous 41 comic strip 41 T. rex 41 Poinar 41 Homo erectus 41 tyrannosaur 41 herbivorous 41 Tiktaalik 41 velociraptor 41 Cro Magnon 40 multicellular 40 flightless birds 40 plesiosaur 40 hominid 40 HR Pufnstuf 40 Carboniferous 40 comic strips 40 bipeds 40 saber toothed cats 40 periodical cicadas 40 Tyrannosaurus 40 frogs toads 40 hominins 40 #AD [003] 39 Neanderthals 39 Homo sapiens 39 billed dinosaur 39 giant tortoises 39 wombats 39 tar pits 39 Columbian mammoth 39 Extinct 39 Indohyus 39 Brachiosaurus 39 extinct species 39 PBS.org 39 inhabited 39 giant tortoise 39 Dinosaurs 39 fossilized 39 Ice Age 39 T rex 39 Australopithecus afarensis 39 Al Capp 39 tetrapods 39 genus Homo 39 angiosperms 38 hominids 38 Tyrannosaurus Rex 38 sea anemones 38 Nickelodeon cartoon 38 cave dwelling