Passbook rhymes with:
sourcebook, bankbook, checkbook, cookbook, guidebook, handbook, hornbook, jokebook, logbook, matchbook, notebook, omnibook, overbook, pocketbook, powerbook, redbook, rulebook, schoolbook, scrapbook, sketchbook, sourcebook, storybook, subnotebook, textbook, yearbook
Passbook sounds like:
pacific, pacific's, pacifica, pacifico, pago_pago, passbooks, paysops, pickups, piggyback, poughkeepsie, poughkeepsie's, push-ups, pushups