1 syllable:
-ward, berde, bered, bird, birde, birred, blurred, braird, burd, burred, byrd, chirred, churred, curd, derde, dmard, dword, ferd, ferde, furred, gerd, gird, gjerde, heard, herd, herde, hird, hurd, jerde, jered, jerred, kurd, kurde, leard, lered, nerd, peard, pferd, purred, sherd, shirred, slurred, smurd, spred, spurred, stirred, swerd, thered, third, tyred, werde, whirred, word, wurde, xword

2 syllables:
1password, absurd, absurde, alward, antbird, ant bird, averred, backsword, beambird, beancurd, bean curd, bearherd, begird, bellbird, beschwerde, bestirred, bloodbird, bluebird, bluebird', brad bird, byword, cagebird, catbird, catchword, chauffeured, coarse-furred, codeword, concurred, conferred, cowbird, cowherd, crankbird, crossword, curse word, cussword, deathbird, deferred, demurred, deterred, doughbird, dunbird, ebird, egg-bird, elsword, engird, fig-bird, flamebird, foreword, frostbird, game bird, get word, ghost word, good word, gooseherd, gosherd, greatsword, greenbird, guideword, gunbird, hairbird, half-heard, hangbird, haybird, headword, head word, hotspurred, humbird, hybird, icebird, incurred, inferred, interred, jailbird, keyword, key word, kingbird, leafbird, ling-bird, liskeard, long-spurred, longsword, lovebird, lyre-bird, lyrebird, mailbird, maybird, misheard, moor-bird, moorbird, moosebird, mound-bird, moundbird, mousebird, nayword, night-bird, nightbird, nightbirde, night bird, occurred, oilbird, one-third, oxbird, password, peabird, phoneword, poebird, pre-bird, prefered, preferred, proword, puffbird, qua-bird, queer bird, railbird, rainbird, rare bird, recurred, redbird, reedbird, referred, reheard, reword, ricebird, ride herd, ringbird, root word, safeword, sauwerd, scrub-bird, scrubbird, scrub bird, seabird, sea bird, sedge bird, send word, shadbird, shagird, shoebird, shorebird, shore bird, short-spurred, skatebird, smallsword, smear word, snakebird, snow-bird, snowbird, song-bird, songbird, speedbird, starbird, stiltbird, stinkbird, stonebird, sue bird, sunbird, surfbird, swanherd, swearword, swineherd, t-bird, tbird, the l word, thornbird, thumbbird, tonguebird, transfered, transferred, troopbird, troutbird, uncured, ungird, unheard, unherd, unstirred, vaxherd, wallbird, warbird, watchword, waxbird, weet-bird, westword, wetbird, wheatbird, wheelbird, yardbird, young bird, zubird

3 syllables:
abiword, afterword, amber heard, babybird, baby bird, borujerd, bower-bird, bowerbird, bristlebird, butcher-bird, butcherbird, butterbird, cedarbird, content word, counterword, cushewbird, dickey-bird, dickeybird, dicky-bird, dickybird, disinterred, dollarbird, doubleword, early-bird, entry word, firebird, flappy bird, flightless bird, flying bird, forty-third, frankenword, friarbird, frigatebird, frigate bird, function word, galley-bird, gallows bird, gaolbird, glossy-furred, gray catbird, gray kingbird, honeybird, humming-bird, hummingbird, lady-bird, ladybird, mocking-bird, mockingbird, morgan hurd, mutton-bird, myna bird, myrtle bird, netherbird, nettlebird, oceanbird, ovenbird, overgird, overheard, overword, phoebe bird, pseudoword, reinterred, reoccurred, riflebird, satin bird, shrek the third, spoken word, sugarbird, tailorbird, tax-deferred, thirty-third, thunderbird, tropicbird, tropic bird, twenty-third, tyrant bird, undergird, undeterred, unpreferred, wading bird, waterbird, water bird, wattlebird, weasel word, weaverbird, whirlybird, widow bird, word for word, written word, yellowbird

4 syllables:
adjutant bird, apostlebird, aquatic bird, baltimore bird, blue mockingbird, canary bird, crocodile bird, eastern kingbird, elephant bird, fairy bluebird, ford thunderbird, indigo bird, main entry word, opposite word, pelagic bird, policeman bird, richard e. byrd, rifleman bird, summer redbird, umbrellabird, umbrella bird, western kingbird, whitney wolfe herd

5 syllables:
arkansas kingbird, coastal diving bird, equivalent word, oceanic bird, raptorial bird, secretarybird, secretary bird, subordinate word

6 syllables:
pontiac firebird, vegetable hummingbird

7 syllables:
inherently funny word, operation mockingbird, theater of the absurd

2 syllables:
graybeard, tapered, greybeard, labored, laboured