Words That Rhyme With "Harmonium" :
3 syllables:
4 syllables:
ammonium, hydronium, Iconium, ionium, meconium, phosphonium, plutonium, polonium, stramonium, sulfonium, sulphonium, syconium, zirconium
5 syllables:
androconium, archegonium, ascogonium, carpogonium, cuprammonium, diazonium, hydroxonium, oogonium, pandemonium, pelargonium, perigonium, positronium, sporogonium