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