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