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