1 syllable:
&burn, bearn, bern, berne, birne, bkorn, burn, burn-e, burne, byrne, cern, cerne, chern, cherne, churn, cleburne, dearn, dern, derne, dirne, durn, earn, erne, fearn, ferne, gerne, hearn, hearne, hern, herne, hirn, hurn, j-turn, journ, kearn, kern, kerne, kirn, learn, morne, quern, scern, shern, spurn, stearn, stearne, stern, sterne, stirn, sturn, terne, thurn, turn, turne, urn, vern, verne, yearn, yerne, zurn

2 syllables:
adjourn, ahearn, ahern, aherne, alpern, alterne, amburn, asperne, attorn, bradburn, brightburn, bruce dern, camburn, cisturn, clayburn, cockburn, cogburn, concern, concern', crewkerne, decern, deturn, discern, disturn, diurne, dornbirn, downturn, eastburn, edirne, etern, eterne, excern, extern, externe, fairburn, fishburn, flip-turn, footworn, freeburn, gehirn, glassburn, glenburn, good turn, half-turn, hardfern, heartburn, hebburn, iceburn, ill turn, imgburn, interne, inturn, in turn, kick turn, kinburn, lampern, lantirn, lavern, laverne, lean-burn, lisburn, luverne, marshburn, mashburn, mcgurn, mckern, milburn, minturn, misturn, mowburn, new-bern, newburn, new bern, nocturn, o'beirne, o'byrne, o'hearn, o'hern, obyrne, ohearn, ohern, osburn, outburn, pangburn, re-turn, reburn, redburn, redfern, rejourn, return, rootcern, rope burn, sauterne, secern, self-bern, sideburn, springburn, stem turn, still-burn, stjerne, sunburn, tea urn, u-turn, unturn, unworn, upturn, washburn, washburne, winburn, windburn, wood-fern, woodburn, woodfern

3 syllables:
about-turn, about turn, altbayern, ampere-turn, arterburn, butter churn, cisternerne, coffee urn, counterturn, day return, devil's urn, erwidern, false return, in return, joint return, otterburn, overburn, overturn, overworn, readjourn, self-concern, sempiterne, slash-and-burn, taciturn, tax return, unconcern, underturn, winter urn, with concern

4 syllables:
banking concern, business concern, carriage return, cigarette burn, earthly concern, gabriel byrne, overconcern, pay as you earn, printing concern, sale-or-return, without concern, worldly concern

5 syllables:
amended return, income tax return, packaging concern, point of no return

6 syllables:
exponential return, information return, mecklenburg-vorpommern

7 syllables:
estimated tax return

1 syllable:
shorn, torn, thorn, bairn, borne, warn, worn, yarn, cairn, horn, porn, sworn, barn, mourn, morn, scorn, bourn, corn, born, bourne, darn

2 syllables:
adorn, lowborn, firstborn, reborn, seed corn, tricorn, sweet corn, forlorn, post horn, unborn, dent corn, french horn, bass horn, flint corn, field corn, spun yarn, rope yarn, stillborn, forewarn, be born, careworn, car horn, casern, christ thorn, cowbarn, cow barn, crow corn, green corn, hedge thorn, horse barn, relearn, soft corn, timeworn, tithe barn, unlearn, unsworn, war-worn

3 syllables:
english horn, squirrel corn, basset horn, powder horn, candy corn, city-born, fire thorn, flour corn, foreign-born, guinea corn, little horn, motor horn, spindle horn, sugar corn, yankee corn

4 syllables:
indian corn, baritone horn, edible corn, egyptian corn, evergreen thorn

5 syllables:
chili con carne, jerusalem thorn, automobile horn

8 syllables:
naked as the day one was born, naked as the day you were born