No precise rhymes, *BUT* here are a list of close rhymes from http://www.rhymezone.com:
4 syllables:
animism, atavism, cataclysm, catechism, magnetism, masochism, pragmatism, vandalism
5 syllables:
anachorism, antagonism, diastrophism, evangelism, expansionism, fanaticism, mercantilism, metabolism, monasticism, naturalism, romanticism
6 syllables:
ferromagnetism
7 syllables:
electromagnetism