bun bur bus but nub nus nut rub run rut sub sun tub tun uns urb urn uts
brut buns bunt burn burs bust buts nubs nuts rubs runs runt rust ruts snub stub stun tubs tuns turn urbs urns
brunt bunts burns burnt burst runts turns
Some random words: nondescriptive nondescript nondependence nondepartmental nondenominational