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