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