prehistory

noun 0.772

prehistorian

noun 0.657

ice age

noun 0.629

ancient

noun 0.612

past historic

noun 0.609

historic present

noun 0.577

antiquity

noun 0.571

deep history

noun 0.567

nuclear age

noun 0.566

historical

noun 0.564

ancientness

noun 0.556

predate

noun 0.546

archaean

noun 0.541

paleontology

noun 0.541

archaic

noun 0.539

golden age

noun 0.536

caveman

noun 0.536

primitive

noun 0.531

age

noun 0.530

paleoclimate

noun 0.522

archaeology

noun 0.520

precolonial

noun 0.519

dinosaur

noun 0.516

palaeontology

noun 0.515

preculture

noun 0.514

day and age

noun 0.510

history

noun 0.508

primeval forest

noun 0.508

time immemorial

noun 0.507

preliterate

noun 0.506

paleoenvironment

noun 0.502

paleontologist

noun 0.501