Prehistoric rhymes with:
historic, historic, historic, historic, borek, boric, caloric, choric, corrick, couric, doric, dysphoric, euphoric, florek, historic, jirik, lorek, lorick, meteoric, moric, norick, orick, orrick, perchloric, roehrich, rohrich, rorick, siewiorek, sirek, stivoric, warrick, yorrick, zorich
Prehistoric sounds like:
perestroika, persecutors, procedures, proctor's, proctors, projectors, prosecutor's, prosecutors, prosecutors'