Bastions rhymes with:
sebastian's, sebastian's, christians, question's, questions, questions', sebastian's, suggestions, abstentions, appalachians, christians, fortune's, fortunes, hitchens, houtchens, hutchens, intentions, interventions, kitchen's, kitchens, luncheons, mansions, misfortunes, question's, questions, questions', sebastian's, suggestions, tensions, urchins
Bastions sounds like:
babysitting, backdating, bagdonas, basting, begetting, besetting, besting, bestowing, biosystems, boasting, bogdanowicz, bogdanski, boosting, boston's, bostonians, boycotting, busting