Terrorists' rhymes with:
counterterrorists, counterterrorists, counterterrorists, behaviorists, consumerists, counterterrorists, flavorists, futurists, humorists, militarists, secularists, theorists
Terrorists' sounds like:
target's, targets, terroristic, terrorists, theorists, thrusts, thursday's, thursdays, tourists, tracts, tragedies, trust's, trustco, trustee's, trustees, trustees', trusthouse, trusts, trusts', turcotte's