Rulebook rhymes with:
schoolbook, schoolbook, bankbook, checkbook, cookbook, guidebook, handbook, hornbook, jokebook, logbook, matchbook, notebook, omnibook, overbook, passbook, pocketbook, powerbook, redbook, schoolbook, scrapbook, sketchbook, sourcebook, storybook, subnotebook, textbook, yearbook
Rulebook sounds like:
railbike, ralph's, ralphs, relapse, relapses, reliefs, relieves, roelofs, rohlfs, rolfes, rolfs, rollback, rollbacks