Words That Rhyme With "Quinquennium" :
3 syllables:
conium, cranium, minium, rhenium
4 syllables:
actinium, ammonium, Asplenium, biennium, bucranium, calcaneum, decennium, delphinium, didinium, dominium, einsteinium, euphonium, geranium, germanium, harmonium, helenium, hydronium, hymenium, Iconium, illinium, ionium, meconium, millennium, neptunium, phosphonium, plutonium, polonium, proscenium, prytaneum, quadrennium, ruthenium, selenium, septennium, stramonium, sulfonium, sulphonium, syconium, titanium, triclinium, triennium, uranium, virginium, zirconium
5 syllables:
androconium, archegonium, ascogonium, bimillennium, carpogonium, chondrocranium, condominium, cuprammonium, diazonium, endocranium, Herculaneum, hydroxonium, oogonium, pandemonium, parascenium, pelargonium, pericranium, perigonium, peritoneum, positronium, protactinium, sporogonium, succedaneum, suppedaneum, uredinium
6 syllables:
ferrotitanium, ferrozirconium, hexamethonium, protoactinium, spermatogonium