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