Here's what rhymes with rup.
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rub rut but such what much blood cut judge sub touch club flood mud shut hut bud butt gut nut tub clutch grudge hub nought pub shrub sludge budge cub grub mot thud crutch cud dub glut nudge putt slut tut wot drudge fudge scrub stud strut stub rebut snub uncut somewhat overmuch coconut insomuch undercut lump rump pump jump pulp bump dump plump clump cusp hump slump thump trump gulp sump stump