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