Here's what rhymes with feathertail.
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 curtail hale braille kale faille wale hightail detail scale entail frail email quail snail flail quale bewail derail unveil grail impale carrell prevail travail inhale exhale fingernail gunwale pigtail topsail foresail taffrail bobtail wassail pellmell mainsail ponytail monorail nonpareil swallowtail hangnail lugsail countervail martingale tattletale