Catalyst's rhymes with:
environmentalists, environmentalists', fatalists, fundamentalists, instrumentalists, analyst's, analysts', centralists, colonialists, criminalist's, criminalists, cyclists, editorialists, environmentalists, environmentalists', evangelists, fatalists, federalists, fundamentalists, generalists, imperialists, individualists, industrialists, instrumentalists, internationalists, journalist's, journalists', loyalists, medalist's, medalists, moralists, motorcyclists, nationalists, naturalists, panelists, populists, semifinalists, socialists', specialists', spiritualists, survivalists