popism1
/ˈpəʊpɪz(ə)m/(also popeism) derogatory. Now historical
noun
Roman Catholicism; papalism.
Origin
Mid 19th century; earliest use found in Thomas Carlyle (1795–1881), author, biographer, and historian. From pope + -ism.
popism2
/ˈpɒpɪz(ə)m/(also POPism, Popism)
noun
1Usually with capital initial. = pop art; the pop art movement; the attitudes, qualities, impact, etc., associated with pop art.
2The qualities, ideals, etc., of pop music.
Origin
1980s. From pop + ism.