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