1 syllable:
art, bart, blart, cart, carte, chart, charte, clart, daart, dart, dartt, dmart, dpart, fahrt, fart, gkart, haart, hardt, hart, harte, hartt, heart, kaart, karte, kwart, lyart, mahrt, mart, marte, narte, p-chart, part, parte, scart, schardt, slart, smart, smartt, spart, staart, start, svart, taart, tart, tarte, tartt, vaart, zp theart

2 syllables:
abart, ahart, apart, assart, astart, astarte, at heart, banghart, barnhardt, barnhart, bar chart, bass part, baumgardt, baumgart, baumhardt, betschart, bi-mart, bickhart, bit part, bizmart, blackheart, black art, bogart, booksmart, bornhardt, bossart, bosshardt, bosshart, breitbart, brillhart, bump-start, by heart, calmart, capehart, carhart, carhartt, castpart, champart, clamart, clipart, cold-start, comart, compart, copart, dalhart, damart, daypart, denhart, depart, descartes, dinehart, disheart, diskpart, dispart, dogcart, dumpcart, dustcart, e-mart, earnhardt, earnhart, earnheart, ecarte, eckardt, eckhardt, eckhart, elkhart, emhart, exparte, eye chart, faintheart, false-heart, false-start, fedmart, fifth part, fine art, flip chart, flockhart, flowchart, flow chart, folk-art, folk art, forepart, foulmart, foumart, four-part, fourth part, fresh start, fullmart, gabehart, gabhart, gayhart, gayheart, gelbart, gephardt, glassheart, go-cart, gocart, golfcart, golf cart, goodhart, goodheart, good part, goulart, greenheart, hackbart, handcart, hardart, headstart, head start, hilgart, hobart, homart, horse-cart, hughart, impart, inkheart, jacquemart, jean smart, jetsmart, jfreechart, jumart, jump-start, jumpstart, k-mart, kabart, kick-heart, kick-start, kickstart, kick start, kithcart, kmart, kwik-e-mart, lanehart, lawn cart, leaphart, leichhardt, lenhardt, lenhart, lienhart, linhardt, linhart, lockart, lockhart, looksmart, luckhardt, luftfahrt, manhart, massart, massmart, mccart, mccartt, meinhardt, meinhart, minehart, miswart, mouthpart, name part, neuhart, newhart, neyhart, nose art, op-art, op art, outpart, outsmart, outstart, oxcart, oxheart, pancarte, parpart, petsmart, pickart, pie chart, plant part, plupart, pop-art, popart, postkarte, purpart, push-start, pushcart, rampart, re-start, redstart, reinhardt, reinhart, rempart, restart, rhinehardt, rhinehart, right smart, rinehardt, rinehart, robart, rockmart, rothbart, schnurrbart, schweighardt, shughart, smithhart, spare part, star chart, steelheart, steinhardt, steinhart, stop-start, street-smart, strongheart, subpart, sweetheart, swigart, swinehart, take heart, take part, teacart, tea cart, tenth part, tipcart, tryart, tub-cart, two-part, tygart, unheart, upstart, urquhart, voice part, wal-mart, walmart, weak part, weinhardt, whip-smart, white-heart, wisehart, wishart, wockhardt, wohlfahrt, wolfheart

3 syllables:
abstract art, after part, alfamart, alphasmart, ansichtskarte, anti-art, applecart, arsesmart, athlete's heart, at the start, autopart, a la carte, benachbart, billycart, bleeding-heart, bleeding heart, body part, bonaparte, break apart, britomart, bullock's heart, bullock heart, buonaparte, color chart, come apart, counterpart, cyclekart, dagenhart, degenhart, donkey cart, dragonheart, earlimart, eberhardt, eberhart, engelhart, enlarged heart, everhardt, everhart, fall apart, familymart, fulimart, garden cart, gayomart, graphic art, hammerheart, heart-to-heart, himmelfahrt, horsecart, hypermart, instacart, interpart, isambart, isenhart, jarvik heart, jiomart, june lockhart, kallapart, keep apart, know apart, laundry cart, line of heart, lion-heart, lionheart, lobster tart, marriage mart, martial art, middelfart, minecart, minimart, misdepart, mollebart, moneybart, multipart, naval chart, nosesmart, open-heart, overpart, pastry cart, pick apart, pilot chart, plastic art, ponycart, pricesmart, pseudo-heart, purple heart, serving cart, set-apart, set apart, shopping cart, snellen chart, speisekarte, take apart, take to heart, tear apart, tease apart, tell apart, thunderheart, touch your heart, travelstart, undercart, underpart, water cart, weather chart, work of art

4 syllables:
a band apart, calorie chart, captain beefheart, commercial art, component part, deviantart, dramatic art, five feet apart, for the most part, gerek meinhardt, indiamart, lili reinhart, mediapart, michelle lenhardt, nina betschart, openclipart, rene descartes, robby steinhardt, state-of-the-art, state of the art, taking apart, uk singles chart, watering cart, when calls the heart

5 syllables:
artificial heart, complex body part, culinary art, whisper of the heart

6 syllables:
atrium of the heart, external body part, imaginary part, navigational chart, organization chart

7 syllables:
jarvik artificial heart, left atrium of the heart, napoleon bonaparte, order of the purple heart, right atrium of the heart

9 syllables:
kidnapping of elizabeth smart

11 syllables:
royal academy of dramatic art