Fortier's rhymes with:
courtiers, courtiers, courtiers, meteors, barriers, blasier's, buddiers, carrier's, carriers, carriers', copiers, courier's, couriers, courtiers, desaulniers, deslauriers, desrosiers, earlier's, exteriors, fanciers, ferriers, furriers, interiors, lemercier's, linear's, meteors, montpelier's, photocopiers, salyers, sconiers, sconyers, superior's, superiors, terriers, warriors, worriers
Fortier's sounds like:
fortress, fortresses, forwarders, frederic, frederica, frederick, frederick's, fredericka, fredericks, frederico, frederika, fredric, fredrich, fredrick, fredricks, fridrich, friederich, friederike, friedrich, friedrichs, friedrick, furthers