Words That Rhyme With "Plutonium" :
3 syllables:
chromium, chthonian, conium, cranium, minium, rhenium
4 syllables:
acromion, aeonian, ammonium, Asplenium, bezonian, biennium, bucranium, calcaneum, chelonian, decennium, delphinium, demonian, Devonian, didinium, dominium, draconian, encomium, eonian, euphonium, favonian, geranium, germanium, gorgonian, harmonium, helenium, hydronium, hymenium, Iconium, illinium, Ionian, ionium, Jacksonian, johnsonian, Jonsonian, Laconian, Lincolnian, meconium, millennium, Oxonian, phosphonium, polonium, proscenium, quadrennium, quinquennium, ruthenium, selenium, Shoshonean, stramonium, sulfonium, sulphonium, syconium, triclinium, triennium, typhonian, uranium, virginium, Wilsonian, zirconium
5 syllables:
Aberdonian, Amazonian, androconium, antinomian, Apollonian, archegonium, Arizonian, ascogonium, Babylonian, bimillennium, Caledonian, Calydonian, carpogonium, chondrocranium, Ciceronian, condominium, cuprammonium, diazonium, Emersonian, endocranium, ferrochromium, Haligonian, Heliconian, Herculaneum, hydroxonium, Jeffersonian, oogonium, Oregonian, pandemonium, parascenium, parkinsonian, Patagonian, pelargonium, pericranium, perigonium, positronium, sporogonium, succedaneum, suppedaneum, Tennysonian, Thessalonian, uredinium
6 syllables:
ferrozirconium, hexamethonium, spermatogonium