Words That Rhyme With "Planetarium" :
3 syllables:
aerial, aerien, areas, Ariel, barium, burial, carious, carrion, cerium, chariot, clarion, corium, curium, darien, fermium, ferreous, glaireous, heriot, lariat, Mariam, Marian, Marion, Marius, Miriam, narial, parian, scariest, scarious, thorium, Varian, variance, variant, variate, various, veriest
4 syllables:
agrarian, albarium, anthurium, aquarium, armarium, barbarian, Bavaria's, Bavarian, bifarious, bivariate, Bulgaria's, Bulgarian, bullarium, burglarious, bursarial, calcareous, cesarean, cibarian, cibarium, ciborium, collyrium, contrarian, contrarious, covariance, covariant, delirium, denarius, emporium, filarial, fossarian, grammarian, gregarious, herbarium, hilarious, Hungarian, Icarian, imperium, invariance, invariant, lararium, librarian, lunarian, malarial, masurium, mezereum, nefarious, orarion, orarium, ovarian, ovarium, planarian, precarious, prokaryote, puparium, reburial, rhinarium, riparian, rosarian, rosarium, sacrarium, salariat, samarium, senarius, sensorium, septarium, solarium, tellurium, terrarium, Tocharian, triforium, vagarious, velarium, vicarial, vicarious, vivarium, vulgarian, Wagnerian
5 syllables:
acinarious, actuarial, adversarial, anticarious, antiquarian, apiarian, archesporium, aspersorium, Belisarius, centenarian, cinerarium, collunarium, columbarium, commissarial, commissariat, culinarian, Delawarean, endosporium, epineurium, estuarial, ferrocerium, formicarium, frigidarium, honorarium, infirmarian, leprosarium, Megatherium, mesothorium, millenarian, multifarious, multivariate, necessarian, oceanarium, octonarius, omnifarious, ostensorium, polyparian, prelapsarian, puerperium, retiarius, sanitarium, seminarian, septenarius, Stradivarius, subdelirium, sublapsarian, synaxarium, temerarious, termitarium, turbellarian, veterinarian
6 syllables:
abecedarian, abecedarium, alcyonarian, anticlinorium, antimalarial, armamentarium, avicularium, clavicytherium, disciplinarian, infralapsarian, itinerarium, nonagenarian, octogenarian, polyzoarium, predestinarian, premillenarian, quadragenarian, quinquagenarian, radiolarian, radiothorium, sexagenarian, suburbicarian, supralapsarian