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