Briefcases rhymes with:
bookcases, showcases, staircases, suitcases, aerospace's, airspaces, birthplaces, bookcases, cyberspace's, databases, interfaces, marketplace's, marketplaces, outpaces, showcases, staircases, suitcases, workplaces
Briefcases sounds like:
barb's, barbakow, barbash, barbecue, barbecue's, barbecues, barbeque, barbeques, barbie's, barbies, barbosa, barboza, barbs, barfuss, barovic, barovsky, berbick, bierbusse, brabec, braves, braves', brebach, brevig, brevik, bribes, briefcase, briefs, brobeck, brubeck, burbach, burback, burbage, burpees