1 syllable:
acts, ax, axe, backes, backs, bax, black's, blacks, blacks', blacs, bracks, cac's, caq's, clacks, claques, cracks, daccs, dacks, dacs, dax, dax', dracs, dtracs, facce, fax, flachs, flacks, flaks, flax, fracs, hacks, haq's, jack's, jacks, jacques', jaques, knacks, lac's, lachs, lacks, lakhs, lax, mac's, mack's, macks, macs, max, maxx, nste acs, ntacs, pac's, packs, pacs, pacts, pakse, pax, plack's, plaques, plax, quacks, racks, rax, saccs, sachs, sachs', sacks, sacques, sacs, saks, sax, saxe, shacks, slacks, slaxx, smacks, snacks, spacs, stac's, stacks, stacs, tachs, tacks, track's, tracks, trax, traxx, vax, wacks, wax, whacks, wracks, yacks, yax, zack's, zacks, zzzax

2 syllables:
addax, aipac's, ajax, amtrak's, anzacs, attacks, audax, awacs, backpacks, backtracks, banjax, bataks, baumax, baymax, bees-wax, beeswax, blackjacks, blendax, bluestacks, bootblacks, bootjacks, borax, brasstracks, break-axe, breakax, breakaxe, britax, broad-axe, broadax, broadaxe, bushwhacks, buybacks, callbacks, carfax, carjacks, ceefax, chaffwax, cheapjacks, chillax, chirac's, climax, cognacs, colfax, comebacks, compaq's, contacts, contax, coolmax, corax, cutbacks, dewax, dimacs, drawbacks, earth wax, earwax, eastpac's, emacs, ex-lax, fairfax, fairtax, fallax, fallbacks, fastbacks, fastracks, fig wax, filmax, finbacks, flapjacks, flashbacks, flomax, floor wax, fullbacks, galax, gimcracks, givebacks, goobacks, gopac's, gravlax, greenback's, greenbacks, half-tracks, halfbacks, hapax, hardbacks, hardtacks, harpax, hatchbacks, haystacks, hdtracks, hijacks, hogbacks, holdbacks, humpbacks, hunchbacks, ice ax, ice axe, imacs, imax, imax', impacts, instax, intacs, ipecacs, joymax, kgbvax, kickbacks, kipchaks, klymaxx, knapsacks, knick-knacks, knickknacks, kodak's, koufax, kremvax, krymchaks, lac wax, leasebacks, lilacs, limax, lomax, lorax, madlax, malax, mandrax, mastax, mathjax, mcvax, meataxe, mendax, midpac's, mossbacks, muntjacs, mytracks, newsmax, opax, packsacks, packwax, panchax, parmacs, paxwax, paybacks, pentax, picaxe, pickax, pickaxe, pimax, playbacks, poll-tax, pollax, pollaxe, pre-tax, pretax, pullbacks, q-max, qmax, racetracks, ransacks, re/max, redbacks, relax, repacks, ridgebacks, rollbacks, rotax, rothwax, rucksacks, sam & max, scale wax, schweinshaxe, seatbacks, setbacks, shellacs, shoeblacks, showmax, sidetracks, skewbacks, skipjack's, skipjacks, ski wax, skyjacks, slingbacks, smilax, smokestacks, snorlax, snowpacks, soulwax, soundtracks, spacemacs, spalax, spantax, storax, supplejacks, surtax, switchbacks, syntax, tailbacks, tampax, tarmacs, tay-sachs, tecdax, terrax, thermax, throwbacks, thumbtacks, tiebacks, toad-flax, toadflax, trossachs, ty-sachs, unlax, unpacks, vivax, wattstax, wefax, westpac's, wi-max, wimax, wisecracks, wood-wax, xemacs, zwiebacks

3 syllables:
ader wax, afc ajax, affymax, aframax, after-tax, aftertax, almanacks, almanacs, amberjacks, animax, anoraks, antitax, applejacks, armagnacs, atarax, audimax, ava max, bangavax, battle-ax, battle-axe, bithorax, blasterjaxx, bosniacs, brainiacs, cadillac's, cadillacs, canvasbacks, carapax, cardiacs, celiacs, cluniacs, common ax, common axe, corbevax, cornerbacks, crackerjacks, cul-de-sacs, dagger-axe, dayton ax, dayton axe, devil's flax, diamondbacks, disclimax, ecotax, edimax, equifax, erymax, filofax, fireman's ax, fireman's axe, florafax, fosamax, garrulax, give the axe, glycine max, gonyaulax, gravadlax, gunnysacks, halifax, handymax, haversacks, iatacs, interfax, japan wax, leatherbacks, lumberjacks, macintax, maniacs, mbalax, microvax, minimax, miramax, mullenax, natterjacks, neoax, novavax, numberjacks, officemax, omnifax, omnimax, openstax, osedax, overtax, overwax, paperbacks, parallax, petromax, piggybacks, pontiac's, pontiacs, pricklebacks, quarterbacks, razorback's, razorbacks, sassenachs, scolopax, scramasax, sealing-wax, sealing wax, seawaymax, shadowfax, silverbacks, stack-o-tracks, steeplejacks, sticklebacks, subclimax, suezmax, supermac's, supermax, supertax, sycorax, telefax, terramax, thoroughwax, totonacs, trichoplax, turbotax, uemacs, vasomax, weatherwax, western ax, western axe, wolenzac's, xtacacs, zithromax, zodiacs

4 syllables:
737-max, amnesiacs, anticlimax, byrdmaniax, carnauba wax, chylothorax, coeliacs, counter-attacks, counterattacks, demoniacs, elegiacs, endolimax, entothorax, fitgirl repacks, genethliacs, genus galax, haemothorax, hbo max, hemithorax, hemoothorax, hemothorax, hylophylax, insomniacs, mesothorax, metasyntax, metathorax, microemacs, micrognuemacs, mineral wax, morphosyntax, myeloplax, navitoclax, nycticorax, paraffin wax, paranoiacs, parodontax, plectrophenax, pneumothorax, pyothorax, pyrrhocorax, radiofax, simoniacs, squalicorax, stenothorax, stepmaniax, vegetable wax, venetoclax

5 syllables:
802.11ax, animaniacs, boeing 737 max, caterpillar tracks, cephalothorax, dipsomaniacs, egomaniacs, haematothorax, hemophiliacs, henrietta lacks, hermann maurice saxe, kleptomaniacs, monomaniacs, nymphomaniacs, phalacrocorax, plagioclimax, pneumatothorax, pyopneumothorax, pyromaniacs, sexual climax, stellar parallax, vvo2max

6 syllables:
2011 norway attacks, annual parallax, d.c. sniper attacks, diurnal parallax, expectiminimax, haemopneumothorax, hemopneumothorax, hydropneumothorax, megalomaniacs, pneumohemothorax, pneumopyothorax, pyohemothorax

7 syllables:
2008 mumbai attacks, geocentric parallax, horizontal parallax, last tango in halifax

8 syllables:
september 11 attacks

11 syllables:
november 2015 paris attacks

1 syllable:
wraps, taps, maps, scraps, lapse, gaps, traps, facts, caps, flaps, craps, schnapps, capps, schnaps, straps

2 syllables:
elapse, collapse, perhaps, contracts, relapse, attracts, prolapse, reacts, shoot craps

3 syllables:
book of facts, book of maps, pezophaps

4 syllables:
aspidelaps, dendrocolaptes, rhynchoelaps

7 syllables:
creating by mental acts