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