Rhyme Desk
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Words That Rhyme With "Biennium" :

3 syllables:

conium, cranium, minium, rhenium

4 syllables:

actinium, ammonium, Asplenium, bucranium, calcaneum, compendium, decennium, delphinium, dickensian, didinium, dominium, einsteinium, euphonium, geranium, germanium, harmonium, helenium, hydronium, hymenium, Iconium, illinium, lawrencium, meconium, millennium, neptunium, phosphonium, plutonium, polonium, proscenium, prytaneum, quadrennium, quinquennium, Rubensian, ruthenium, selenium, septennium, stramonium, sulfonium, sulphonium, syconium, titanium, triclinium, triennium, uranium, virginium, Waldensian, zirconium

5 syllables:

Albigensian, androconium, antependium, antimensium, archegonium, ascogonium, bimillennium, carpogonium, chondrocranium, condominium, cuprammonium, diazonium, endocranium, Herculaneum, hydroxonium, oogonium, pandemonium, parascenium, pelargonium, pericranium, perigonium, peritoneum, positronium, protactinium, salientian, sporogonium, succedaneum, suppedaneum, uredinium

6 syllables:

ferrotitanium, ferrozirconium, hexamethonium, protoactinium, spermatogonium

7 syllables:

actinouranium, radioactinium