Mammoth Uncensored Word List:
40 words ending with up, 7 letters long

breakup brushup buildup catchup checkup chellup chirrup cleanup closeup coverup crackup flareup giddyup giltcup grownup ingroup ketchup kingcup matchup oversup precoup pressup regroup roundup scaleup screwup shakeup shapeup smashup speedup stackup standup startup stickup stirrup stuckup touchup wickiup wickyup writeup