Here's what rhymes with caravanserail.
rail male fail mail sale pale sail tail tale trail avail jail nail veil frail gale hail shale whale bail vale wail assail bale dale pail flail hale braille kale grail faille wale carrell scale email stale curtail quail snail quale derail unveil foresail hightail detail prevail entail travail inhale fingernail bewail gunwale mainsail impale monorail taffrail wassail pellmell hangnail lugsail exhale pigtail topsail countervail bobtail nonpareil swallowtail ponytail martingale tattletale