Extremists rhymes with:
animists, chemists, conformists, nonconformists, taxidermists, abolitionists, activists, allergist's, allergists, analysts, anarchists, anesthesiologists, animists, antagonists, anthropologists, anti-federalists, apologists, aquarists, arsonists, artist's, artists, artists', atheists, august's, ballasts, baptists, biologists, breakfasts, buddhists, capitalists, catalysts, chauvinists, chemists, columnists, communist's, communists, conformists, conservationists, dentists, donatists, druggist's, druggists, endocrinologist's, endocrinologists, entomologists, ernest's, ernests, everest's, exhibitionists, fascists, feminists, fetishists, finalists, forest's, forests, geneticists, guitarist's, guitarists, gynecologists, harvests, herbalist's, herbalists, herbalists', humanists, illusionist's, illusionists, institutionalists, interests, jansenists, journalists, locusts, modernists, motorists, neurologists, nihilists, nonconformists, novelists, obstructionists, orthodontist's, orthodontists, orthopedists, pathologists, perfectionists, pianist's, pianists, platonists, propagandists, protagonists, psychiatrist's, psychiatrists, psychologists, purists, rainforests, satirists, scientologists, seismologists, socialists, soloists, specialists, symbolists, taoists, taxidermists, televangelists, terrorists, therapist's, tourists, traditionalists, ultranationalist's, ultranationalists, urologists, violinists, violist's, violists, zoologists