Precambrian rhymes with:
cambrian, cambrian, cambrian, cambrian, adrian, aerien, agrarian, algerian, arian, arthurian, aryan, assyrian, austrian, authoritarian, bagdasarian, barbarian, bavarian, berberian, berrian, berrien, bilzerian, biospherian, bulgarian, burian, cambrian, carrian, carrion, centenarian, centurion, clarion, contrarian, criterion, cyprian, darien, delorean, derderian, disciplinarian, dorian, ecuadorean, ecuadorian, egalitarian, equestrian, eskandarian, florian, geoffrion, gregorian, guderian, gurian, gurion, hadrian, hanoverian, historian, humanitarian, hungarian, hyperborean, hyperion, iberian, illyrian, irian, ivorian, kasparian, kazarian, kerien, kerkorian, krikorian, kurian, lancastrian, lauretarian, liberian, libertarian, librarian, lorean, magarian, majoritarian, marian, marion, markarian, merion, missourian, mitochondrion, mondrian, myreon, najarian, nazarian, nestorian, nigerian, nonsectarian, octogenarian, ovarian, pagurian, parliamentarian, pedestrian, planarian, praetorian, presbyterian, proletarian, pythagorean, quirion, salutatorian, sectarian, seminarian, septuagenarian, shakespearean, siberian, singaporean, skenderian, syrian, terrien, thraco-illyrian, timurian, toldrian, torian, torreon, totalitarian, unitarian, utilitarian, valedictorian, valerian, varian, vegetarian, venturian, veterinarian, victorian, wagnerian, yerian, zairian, zakarian