4 letters:
bard, blvd, card, gard, hard, lard, nard, yard

5 letters:
alard, baard, barde, byard, carde, chard, erard, garde, giard, guard, huard, icard, k-svd, mocvd, paard, parde, phard, sarde, scard, shard, suard, tarde, varde, vcard, waard, yarde

6 letters:
asgard, barred, bedard, benard, berard, bevard, bovard, boyard, bozard, busard, buzard, canard, charde, decard, denard, dinard, e-card, eckard, edvard, enlard, fayard, fugard, garard, garred, gerard, girard, godard, homard, hucard, jarred, lazard, legard, marred, mccard, menard, minard, mulard, musard, p-card, parred, picard, regard, renard, retard, revard, ricard, rocard, tabard, tarred, upcard, utgard, waarde, warred, zwaard

7 letters:
-barred, adguard, agobard, aircard, amtgard, archard, barnard, beghard, beguard, belgard, bellard, bernard, berrard, billard, blafard, boilard, bolyard, bombard, bongard, bossard, brocard, bunyard, burnard, charred, chocard, cobarde, cocarde, damgard, deckard, dennard, dewaard, diehard, dillard, discard, eckhard, einhard, enguard, esguard, gabbard, gallard, gaspard, geghard, gelbard, gerhard, gibbard, gillard, gilyard, ginyard, giscard, gnarred, gossard, guerard, hilyard, hopyard, innyard, jarrard, keycard, leotard, mullard, newhard, ni-hard, np-hard, panhard, piccard, pickard, poulard, rennard, rutgard, scarred, sinyard, sparred, starred, suchard, sungard, suscard, unguard

8 letters:
armguard, backyard, bankcard, barnhard, barnyard, blancard, blowhard, boatyard, bombarde, boneyard, borchard, bouchard, bouffard, brancard, brochard, bromyard, brossard, burchard, cashcard, datacard, debarred, deeryard, die hard, dockyard, dooryard, drawcard, dungyard, ekkehard, embarred, en garde, eurocard, farmyard, fauchard, filecard, foreyard, glowbard, grignard, grognard, guichard, guinyard, guiscard, hillyard, hortyard, isengard, isracard, jackyard, jacquard, julliard, junkyard, kailyard, kaleyard, kirkyard, lienhard, maillard, mansarde, marquard, meinhard, melgaard, metacard, meteyard, mouchard, moutarde, mudguard, notecard, on guard, outguard, overcard, pericard, postcard, racecard, railcard, railyard, reinhard, safecard, semihard, shipyard, shurgard, telecard, tiltyard, timecard, tonocard, unbarred, valeyard, vanguard, vuillard, whinyard, wildcard, willyard, wirecard, woodyard, zinecard

9 letters:
adenocard, appleyard, arm guard, bank card, bestarred, blow-hard, bodyguard, boucharde, bouffarde, boulevard, brickyard, broussard, cabochard, chauffard, chouinard, colombard, costarred, couillard, coulthard, courtyard, dai-guard, disbarred, disregard, engelhard, face card, fireguard, fishguard, flashcard, graveyard, greencard, grossbard, hildegard, hole card, hypercard, instarred, langobard, leaf lard, lifeguard, longobard, main yard, metrocard, microcard, milliarde, misregard, moneycard, navy yard, newsguard, noseguard, off-guard, off guard, old guard, overgaard, phonecard, pickguard, pockarred, punchcard, rearguard, rock-hard, rope yard, rouillard, safeguard, scorecard, scrapyard, shinguard, show card, side yard, smartcard, stackyard, steelyard, stockyard, studtgard, telengard, tilt-yard, undercard, unscarred, unstarred, videocard, vieillard, waldegard, wasteyard, wild-card, wireguard

10 letters:
afterguard, avantgarde, bank guard, beauregard, bellegarde, blackguard, body-guard, body guard, brouillard, camelopard, campagnard, chainguard, churchyard, co-starred, coastguard, court card, creditcard, crossguard, crowbarred, cubic yard, ddos-guard, door guard, drakengard, drouillard, face guard, false-card, flash card, front yard, green card, hildegarde, keep guard, lettercard, lumberyard, mastercard, montagnard, mouthguard, passegarde, punch card, rear-guard, sauvegarde, schoolyard, scotchgard, shin guard, stableyard, st bernard, switchyard, timberyard, travelcard, trump card, union card, waste-yard, watchguard, yellowcard

11 letters:
avant-garde, avant-guard, avant garde, banlieusard, barclaycard, cattleguard, charge card, charliecard, coast-guard, color guard, credit-card, credit card, crossbarred, easter card, expresscard, fond regard, gaming card, honor guard, ill-starred, molly-guard, paysafecard, postal card, ration card, report card, scratchcard, self-regard, sneezeguard, splashguard, square yard, stack-guard, stand guard, strike hard, swiss chard, watch guard, westergaard, yellow-card

12 letters:
bumper guard, calling card, castle-guard, chicken yard, circuit card, close-barred, colichemarde, compass card, counterguard, daughtercard, drawing card, hlinka guard, leather-hard, library card, mailing-card, penalty card, picture card, playing card, prison guard, punched card, railway yard, splash-guard, trading card, undersparred

13 letters:
advance-guard, alain bernard, baseball card, birthday card, boarding card, business card, finn wolfhard, get-well card, greeting card, identity card, off her guard, off his guard, on your guard, provost guard, saint bernard, scotland yard, sympathy card, tulsi gabbard, visiting card

14 letters:
battle-scarred, christmas card, crossing guard, multimediacard, national guard, naval shipyard, off your guard, on one's guard, security guard

15 letters:
borrower's card, david coulthard, field of regard, jean-luc godard, membership card, no-holds-barred, off one's guard

16 letters:
picture-postcard, picture postcard, praetorian guard, upon one's guard

17 letters:
amazon lumberyard, new scotland yard

19 letters:
yeoman of the guard

21 letters:
live free or die hard

22 letters:
a good day to die hard, the hitman's bodyguard

25 letters:
hitman's wife's bodyguard

4 letters:
nerd, curd, herd, word, bird, lord, gird, ford, byrd, ward, cord, hurd

5 letters:
laird, beard, sward, weird, cared, dared, chord, fjord, lured, third, eared, mired, gourd, sherd, horde, hoard, sword, board, wired, award, aired, bored, cured, heard, bared, baird, fared, njord

6 letters:
adored, toward, burred, furred, absurd, afford, geared, reward, inured, aboard, stared, begird, scored, spared, stored, haired, paired, shared, scared, reword, gourde, feared, accord, record, afeard, flared, poured, roared, soared, toured

7 letters:
unheard, matured, revered, blurred, expired, ignored, slurred, attired, stirred, endured, floored, sheared, afeared, assured, spurred, smeared, secured, cleared, squared, retired, chaired, insured, cheered, there'd, unaired, uncured, where'd

8 letters:
restored, impaired, declared, untoward, required, unpaired, incurred, laboured, appeared, interred, prepared, repaired, referred, sea bird, deferred, explored, compared, ant bird, deterred, get word, go board, key word, obscured, occurred, ungeared, unmarred, unshared

9 letters:
reassured, preferred, good word, game bird, uninsured, unsecured, conferred, big board, prerecord, sash cord, overheard, uncolored, rare bird, bean curd, baby bird, besmeared, disaccord, dog-eared, head word, in accord, longbeard, myna bird, one-third, pioneered, rag gourd, ride herd, root word, send word, unattired, uncleared, undergird, unsheared

10 letters:
curse word, widow bird, unexplored, undeclared, unprepared, water bird, vocal cord, ghost word, henry ford, unimpaired, undeterred, blackbeard, dart board, engineered, entry word, goatsbeard, interfered, night bird, phone cord, power cord, press lord, queer bird, salt-cured, satin bird, scrub bird, sedge bird, shore bird, smear word, sour gourd, unrepaired, unrestored, young bird

11 letters:
spinal cord, disappeared, tropic bird, bungee cord, tape record, draft board, weasel word, volunteered, wading bird, transferred, canary bird, back-geared, be restored, bread board, crown beard, feudal lord, floor board, flying bird, gerald ford, indigo bird, myrtle bird, phoebe bird, quick-eared, sharp-eared, smoke-cured, spoken word, tyrant bird, underscored

12 letters:
gallows bird, frigate bird, diving board, content word, golden horde, bedford cord, school board, bottle gourd, common chord, gypsum board, appeal board, aquatic bird, baffle board, beaver board, binder board, ledger board, light-haired, lion's beard, memory board, mother board, notice board, oceanic bird, pelagic bird, self-assured, shovel board, sponge gourd, twenty-third, world record, written word, zoning board

13 letters:
cutting board, umbrella bird, word for word, ironing board, seventh chord, running board, elephant bird, function word, circuit board, drawing board, adjutant bird, appeals board, buffalo gourd, butcher board, cavalry sword, control board, council board, display board, double-geared, electric cord, fencing sword, hospital ward, opposite word, prairie gourd, rifleman bird, writing board

14 letters:
strike a chord, secretary bird, particle board, umbilical cord, skirting board, sandwich board, shoulder board, extension cord, sounding board, bulletin board, crocodile bird, advisory board, baltimore bird, chopping board, cribbage board, drafting board, draining board, expense record, gerald r. ford, imperial beard, medical record, missouri gourd, monopoly board, planning board, policeman bird, raptorial bird, telephone cord, throwing board, written record

15 letters:
criminal record, equivalent word, flightless bird, governing board, jupiter's beard, main entry word, old man's beard, stock of record

16 letters:
backgammon board, corrugated board, graphical record, hearing-impaired, subordinate word

17 letters:
visually impaired, composition board, historical record, phonograph record

18 letters:
golden crown beard

19 letters:
coastal diving bird, gerald rudolph ford

20 letters:
congressional record, chronological record, epiphany of our lord

21 letters:
federal reserve board, chairman of the board, theater of the absurd, stockholder of record, ascension of the lord

25 letters:
electronic bulletin board