3 letters:
cup, pup, sup, upp, yup

4 letters:
bupp, cupp, hupp, rupp

5 letters:
bacup, canup, chupp, cutup, fedup, getup, grupp, hicup, jsonp, knupp, krupp, letup, njdep, nohup, pinup, puppe, re-up, runup, ruppe, setup, shmup, shtup, shupp, situp, skrip, stupp, sumup, suppe, throp, trupp, wasup

6 letters:
act-up, all-up, backup, blowup, bootup, burnup, cockup, crudup, cut-up, dialup, dustup, eggcup, eyecup, faceup, fit-up, fix-up, foldup, fry-up, get-up, hangup, hickup, holdup, hookup, jam-up, jessup, kickup, kip-up, lay-up, leg-up, lendup, let-up, lineup, linkup, lit-up, lockup, madeup, makeup, mangup, markup, mashup, meetup, mix-up, mockup, moosup, mop-up, navsup, nip-up, oilcup, one-up, pay-up, pickup, pileup, pin-up, pissup, pop-up, prenup, pushup, put-up, riseup, run-up, schlup, schtup, schupp, selkup, sendup, set-up, shutup, sidcup, sighup, sit-up, slipup, strupp, sum-up, sun-up, suncup, takeup, teacup, tie-up, tip-up, tittup, ton-up, top-up, tossup, truppe, tuneup, turnup, two-up, wakeup, walkup, warmup, washup, wickup, windup, zip-up

7 letters:
back-up, bang-up, beat-up, blow-up, boot-up, breakup, brew-up, brushup, buildup, burn-up, bust-up, call-up, checkup, chin-up, cleanup, closeup, cock-up, coverup, crackup, dial-up, dust-up, egg-cup, envolup, errno.h, eye-cup, face-up, fill-up, flip-up, fold-up, foul-up, frameup, fuck-up, give-up, goldcup, goof-up, greenup, grownup, gupshup, hang-up, high-up, hold-up, hook-up, hung-up, jack-up, jump-up, kingcup, lace-up, lash-up, lead-up, leafcup, line-up, link-up, lock-up, look-up, made-up, make-up, mark-up, mash-up, matt-up, mess-up, mishcup, mock-up, mooncup, muck-up, northup, nosh-up, paid-up, pasteup, pent-up, pick-up, pile-up, piss-up, pre-nup, printup, pull-up, push-up, ramp-up, rave-up, robocup, roll-up, roundup, scaleup, schrupp, schuppe, send-up, shakeup, shapeup, show-up, shut-up, sign-up, slap-up, slip-up, smashup, speedup, spin-up, stackup, stalcup, standup, startup, step-up, stickup, stuckup, suck-up, take-up, team-up, tidy-up, tilt-up, toss-up, trip-up, true-up, tune-up, turn-up, tweetup, used-up, wake-up, walk-up, warm-up, wash-up, wickiup, wind-up, wisecup, work-up, wrap-up, writeup

8 letters:
balls-up, belly-up, blown-up, booze-up, botch-up, break-up, brush-up, build-up, built-up, bull-pup, carve-up, catch-up, changeup, check-up, clean-up, close-up, clued-up, cover-up, crack-up, dress-up, dried-up, drive-up, flare-up, followup, frame-up, giddy-up, grown-up, half-cup, heads-up, hurry-up, hyped-up, knees-up, knock-up, latch-up, loved-up, match-up, mixed-up, modula-p, paste-up, patch-up, power-up, press-up, punch-up, round-up, scale-up, screw-up, scrub-up, seven-up, sexed-up, shake-up, shape-up, shook-up, shoot-up, skrew-up, smash-up, snarl-up, speed-up, split-up, stallcup, stand-up, start-up, steep-up, stick-up, stuck-up, touch-up, whitecup, wound-up, write-up

9 letters:
arcade1up, beaten-up, beefed-up, boozed-up, bottom-up, buttercup, caller-up, change-up, double-up, drying-up, folded-up, follow-up, fouled-up, freeze-up, fucked-up, heaped-up, higher-up, hopped-up, hushed-up, joined-up, juiced-up, jumped-up, making-up, marked-up, messed-up, muscle-up, puffed-up, pumped-up, rolled-up, runner-up, screws-up, sneak-cup, souped-up, stitch-up, thumbs-up, warmed-up, washed-up

10 letters:
bacdafucup, bundled-up, churned-up, dressed-up, knocker-up, monkey-cup, mopping-up, pick-me-up, runners-up, screwed-up, setting-up, stepped-up, stopped-up, stuffed-up, summing-up, trickle-up, trumped-up, washing-up, winding-up, wrought-up

11 letters:
bacthafucup, buttoned-up, dressing-up, kampfgruppe, lighting-up, pricking-up, puckered-up, shoot-em-up, straight-up

12 letters:
dfl-supercup, rdiff-backup, schutztruppe, thyssenkrupp

13 letters:
arbeitsgruppe, einsatzgruppe, right-side-up, schnez-truppe, sternschnuppe

14 letters:
johnny-jump-up, schwarz-gruppe

15 letters:
well-brought-up

3 letters:
cub, dub, hub, nub, rub, pub, tub, sub

4 letters:
snub, club, grub, drub, stub

5 letters:
shrub, scrub

8 letters:
subshrub