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