3 letters:
bix, dix, fix, hix, mix, nix, nyx, pix, rix, six, wix

4 letters:
brix, frix, styx, tics

5 letters:
17776, 30-06, 4q246, 6-8-6, 80486, affix, am486, ampyx, ats-6, bta-6, c7h16, cat-6, cfm56, cop26, cylix, cyrix, day26, df-26, dicks, egp-6, h.266, hicks, hicss, hk416, hq-16, iapyx, il-76, il-86, il-96, immix, kicks, kn-06, lasix, licks, lm386, mi-26, nicks, ns-16, osx86, picks, pt-76, ricks, rp-46, rpg-6, sf-36, sicks, stics, strix, sts-6, su-76, thrix, ti-86, ticks, topix, unfix, vic's, vicks, wicks, xm806, zis-6

6 letters:
.30-06, 123456, 2n3906, 44/876, affixe, ak-176, am5x86, amos-6, asphyx, avs-36, ba-3/6, base36, bricks, chicks, clicks, cricks, cyp2d6, de-cix, dhcpv6, dick's, dickes, emm386, fickes, flicks, fricks, gaz-46, gaz-66, havrix, kg0516, klicks, knicks, mas-36, maxixe, mazda6, mpt-76, nick's, nikk's, osv-96, permix, phl-16, pmr446, pricks, qsw-06, quicks, rick's, rpg-16, rpg-26, slicks, snicks, spicks, ssh-36, sticks, sts-26, sts-66, tr-106, utf-16, uvb-76, vfa-86, wickes

7 letters:
.338-06, 2-6-6-6, adickes, audi a6, c57bl/6, c6h12o6, chick's, cliques, cp/m-86, delhi-6, depicts, esp8266, goes-16, iron-56, knicks', mgv-176, opticks, overmix, perm-36, picnics, rd-0146, scr-536, sh2-106, sha-256, shticks, stg-556, sts-126, sweet16, tkb-506, toz-106, two-mix, ufc 266, unpicks, upticks, vfa-106, vitamix, wi-fi 6, xfree86

8 letters:
an/spy-6, astron-6, august 6, cake mix, celtics', crucifix, cryonics, cybersix, distichs, dj-kicks, flashpix, fossicks, gw501516, inflicts, inline-6, intermix, iphone 6, kubricks, lofortyx, lunatics, nitpicks, politics, predicts, reliques, schticks, superfix, system76, teejayx6, transfix, unsticks, vaz-2106, vectibix, vortex86, weet-bix

9 letters:
an/apg-66, conflicts, derelicts, dipsticks, earth-616, endothrix, fabletics, far cry 6, fifty-six, forty-six, handpicks, joysticks, k1810vm86, kubrick's, lepothrix, lipsticks, marwick's, memtest86, micronics, mil mi-26, mycothrix, oxygen-16, pasars-16, peaceniks, politicks, politics', quick fix, ready-mix, sidekicks, sixty-six, synaptics, thelema.6, toyota 86, uromastyx, warwick's

10 letters:
18-crown-6, bailiwicks, bill hicks, bolsheviks, chopsticks, comptronix, crabsticks, databricks, eighty-six, fallout 76, firebricks, goldbricks, hwasong-16, leptothrix, little mix, lunachicks, maulsticks, mauser c96, mensheviks, nikki sixx, ninety-six, nogizaka46, poohsticks, projekt-26, river styx, sep-363856, slapsticks, sporothrix, stigmatics, straight-6, thirty-six, toothpicks, twenty-six, yardsticks

11 letters:
android-x86, beggarticks, biopolitics, breadsticks, broomsticks, brownie mix, candlewicks, chlorine-36, magicbricks, matchsticks, nightsticks, seventy-six, shandwick's, smithwick's, soundsticks, tooth-picks, toyota ae86, uranium-236

12 letters:
beggar-ticks, candlesticks, cherry-picks, fiddlesticks, hinatazaka46, lemonade mix, metapolitics, pick-and-mix, purplebricks, right-clicks, sakurazaka46, streptothrix, tindersticks

13 letters:
captain hicks, necropolitics, row of bricks, seal team six, turbografx-16, u.s. route 66

14 letters:
ilyushin il-76, power politics, sig sauer p226, uefa euro 2016

15 letters:
new york knicks, nxt takeover 36, pumped up kicks, resident evil 6, wrestlemania 36

16 letters:
electrogravitics, fast & furious 6, pharmacodymanics, the ridiculous 6

17 letters:
far-left politics, realclearpolitics

18 letters:
far-right politics, heckler & koch g36, left-wing politics

19 letters:
right-wing politics, ufc fight night 196

20 letters:
centre-left politics, give it the deep six, heckler & koch hk416

21 letters:
microsoft office 2016

24 letters:
tom clancy's rainbow six

28 letters:
eurovision song contest 2006, hungarian revolution of 1956

4 letters:
lips, tips, hips, mips

5 letters:
snips, ships, slips, grips, chips, trips, clips

6 letters:
strips, thrips, ship's

7 letters:
ellipse, scripts, eclipse, addicts

8 letters:
convicts, coragyps, eudyptes, tinsnips

9 letters:
tidy tips

11 letters:
amphibolips, cargo ships, contradicts

12 letters:
genus thrips, get to grips, limnocryptes, onion thrips

13 letters:
total eclipse, lunar eclipse, solar eclipse, come to grips

14 letters:
fish and chips, tobacco thrips

15 letters:
partial eclipse, annular eclipse