1 syllable:
-backed, achte, act, backed, blacked, bracht, brachte, bract, clacked, cracked, dachte, flacked, fracht, fract, gackt, gracht, hacked, jacht, jacked, knacked, kracht, lacked, lact-, nackt, pacht, packed, packt, pact, pacte, pracht, quacked, qvacked, racked, rakht, sacked, schacht, schlacht, shacked, slacked, smacked, snacked, stacked, stacte, tacked, tact, takht, tracht, trachte, tracked, tract, trakt, wacked, whacked, wracked, yacked, yakked, zacht

2 syllables:
abstract, adact, air-slacked, anact, attacked, attract, auftakt, backpacked, backtracked, barebacked, betracht, blackjacked, bunch-backed, bushwhacked, car-jacked, carjacked, cei-pact, cextract, close-packed, coact, compact, confract, contact, contract, crookbacked, deact, detract, didact, diffract, distract, eintracht, en-tact, enact, entracte, epact, ex'act, exact, exakt, extract, fast-tracked, finchbacked, galact, galact-, gebracht, gedacht, gedact, genpact, gobsmacked, half-cracked, half-tracked, hardbacked, high-backed, highjacked, hijacked, humpbacked, hunchbacked, impact, infract, intact, jam-packed, jampacked, kompakt, kontakt, kontakte, low-backed, lute-backed, medfact, mossbacked, nerve tract, olfact, one-act, outact, peract, play-act, playact, postact, postfact, preact, prepacked, protract, ransacked, re-act, react, redact, refract, repacked, retract, roach-backed, rofact, rollbacked, round-backed, sanakht, sex act, sidetracked, skyjacked, speech act, stiff-backed, straight-backed, subact, substract, subtract, sway-backed, swaybacked, switchbacked, tarmacked, thumbtacked, tocktact, transact, unbacked, unfact, unhacked, unpacked, unslacked, untracked, vkontakte, well-stacked, wisecracked

3 syllables:
abreact, acetract, action-packed, anteact, antefact, artefact, artifact, asset-backed, autofact, benefact, biofact, broken-backed, camel-backed, cataphract, cateract, chain-react, contrafact, counteract, cross-react, ecofact, edifact, eye contact, fly contact, full-contact, fullcontact, geofact, high-impact, huckle-backed, imfact, incoact, inexact, interact, ladder-backed, lobster-backed, medivaced, medivacked, mortgage-backed, non-contract, noncontract, optic tract, overact, paperbacked, piggybacked, pontefract, precontact, precontract, quarterbacked, razor-backed, re-enact, recontact, reenact, retroact, retrofract, riot act, rotaract, saddle-backed, saddlebacked, shadowpact, sister act, smart contract, special act, spiny-backed, spiritpact, subcontract, tadelakt, tesseract, underact, unexact, vacuum-packed, ventifact

4 syllables:
almond extract, autodidact, bataireacht, breach of contract, cola extract, counterattacked, digestive tract, enviropact, fluidextract, futures contract, gabriel macht, genshin impact, labor contract, lemon extract, marriage contract, matter-of-fact, oral contract, output contract, overreact, politifact, purchase contract, quasi-contract, quasi contract, semi-abstract, semiabstract, semicompact, service contract, social contract, special contract, suicide pact, underreact

5 syllables:
attorney-in-fact, caterpillar-tracked, employment contract, enabling act, gambling contract, legislative act, requirements contract, term of a contract, urinary tract, vanilla extract

6 syllables:
affordable care act, alimentary tract, bilateral contract, conditional contract, create by mental act, electrical contact, respiratory tract

7 syllables:
aleatory contract, gastrointestinal tract, unilateral contract

10 syllables:
occupational safety and health act

1 syllable:
wrapped, rapt, kept, strapped, apt, trapped, slapped, chapped, capped, napped, tapped, snapped, scrapped

2 syllables:
inapt, adapt, untapped, coapt, enwrapped, unmapped, unwrapped

3 syllables:
readapt