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