6 letters:
carcer, parser

7 letters:
sparser

2 letters:
ar, or, er

3 letters:
bur, mir, for, jar, npr, air, par, fur, mar, war, err, far, oar, ore, gar, ear, car, ayr, tor, sir, are, ire, cur, nor, bar, tar, per, fir

4 letters:
deer, bear, pare, lore, more, sour, slur, dare, poor, lour, gore, torr, rear, door, wear, weir, bore, fair, year, tyre, amir, dire, boer, veer, were, spar, gear, hire, boar, hare, lear, core, hour, star, lair, near, sore, tier, mare, jeer, yore, pair, wore, pore, soar, hair, sear, meir, fare, four, herr, doer, fear, fore, tear, carr, scar, bier, parr, care, burr, fire, czar, wire, pour, rare, dour, bare, tsar, blur, birr, lyre, tore, hear, sere, ware, mire, beer, char, spur, emir, dear, hoar, seer, mere, thor, purr, heir, pear, peer, stir, here, roar, barr, adar, pier

5 letters:
khmer, score, loire, aware, blair, assur, barre, whore, crore, churr, queer, snore, skier, glare, blare, ameer, sitar, drear, ne'er, qatar, whirr, flair, chore, scour, defer, cheer, flare, afire, store, amour, spore, dower, senor, demur, steer, safar, corps, share, shirr, babar, stair, unbar, we're, there, snare, chirr, stare, shore, floor, myrrh, spear, their, sneer, inter, quire, shear, swear, adore, spare, smear, dakar, abhor, incur, shire, sheer, dinar, bazar, chair, flour, zaire, occur, refer, scare, blear, starr, clear, moire, infer, deter, spire, decor, murre, swore, recur, where, cigar

6 letters:
lekvar, appear, unfair, velour, impair, guitar, drawer, career, confer, sphere, midair, affair, square, bazaar, aspire, galore, so far, pierre, vigour, endear, disbar, ignore, squire, retire, beware, concur, rehear, repair, prayer, tumour, cohere, valour, severe, claire, prewar, go for, before, qintar, poseur, ashore, prefer, veneer, revere, adhere, voyeur, admire, by far, expire, arthur, bursar, carver, cursor, fervor, mercer, purser, server, surfer

7 letters:
ask for, austere, compere, hot air, big sur, myanmar, respire, rapport, pasteur, hot war, pay for, compare, unclear, inshore, liqueur, premier, anymore, prepare, schmear, require, deplore, pioneer, they're, inquire, postwar, saviour, masseur, cashier, inspire, sincere, restore, bizarre, ensnare, declare, compeer, au pair, succour, unaware, explore, flavour, affaire, despair, wet bar, implore, airfare, corsair, courser, farther, fervour, further, harsher, norther, warfare

8 letters:
grimoire, overhear, look for, call for, nightjar, sea star, polypore, reappear, brumaire, engineer, send for, boer war, milk bar, seigneur, red deer, souvenir, what for, low gear, tank car, cavalier, offshore, due care, saboteur, mutineer, day care, frontier, wood tar, frotteur, dog star, lead ore, ant bear, grandeur, fall for, domineer, pace car, frimaire, bell jar, open air, voltaire, roe deer, monsieur, care for, sea hare, coal tar, debonair, forswear, premiere, cash bar, perspire, done for, pine tar, transfer, sand bar, cold war, endorser, enforcer, observer, wherefor

9 letters:
balladeer, guarantor, leap year, buccaneer, blue star, rock star, puppeteer, fire door, candy bar, light air, stock car, bock beer, life peer, superstar, great war, price war, chevalier, snack bar, raconteur, disappear, inner ear, speak for, joint fir, solitaire, squad car, mouse ear, next door, trap door, insincere, musketeer, all clear, back door, holy year, persevere, musk deer, salad bar, root beer, near beer, gondolier, root hair, volunteer, world war, civil war, profiteer, color bar, spur gear, disrepair, pinch bar, cold sore, barn door, interfere, pap smear, space bar, stand for, cable car, take care, bandolier, racketeer, sightseer, chauffeur, financier, brigadier, au revoir, outer ear, mule deer, high gear, skin care, worm gear, film star, belvedere, wild boar, mason jar, open door, disburser, macarthur, precursor, preserver, therefore, wherefore

10 letters:
answer for, small beer, great bear, buffet car, polar star, pinot noir, bombardier, flare star, first gear, honey bear, cookie jar, racing car, try square, chandelier, bumper car, charioteer, double bar, korean war, light year, liquid air, leyden jar, tidal bore, bevel gear, bath chair, north star, escritoire, commandeer, front door, louis d'or, lawn chair, black bear, pubic hair, dutch door, lunar year, middle ear, solar year, in the air, mal de mer, set square, dining car, polar bear, deck chair, side chair, foursquare, underscore, balsam fir, sports car, heavy spar, child care, heretofore, swing door, shop floor, trojan war, easy chair, petit four, movie star, patrol car, civil year, guard hair, brown bear, giant star, great year, silver fir, auctioneer, police car, stage door, fixed star, estate car, wing chair, teddy bear, koala bear, mouse deer, parlor car, reinforcer, sporophore, timeserver

11 letters:
freight car, baggage car, saddle sore, apgar score, word square, bronx cheer, binary star, kodiak bear, trolley car, pamphleteer, fallow deer, crimean war, uncared-for, gondola car, billionaire, school year, woolly bear, spruce beer, ginger beer, litterateur, doctrinaire, dental care, first floor, dance floor, sedan chair, millionaire, little bear, solar flare, edward lear, connoisseur, candy store, love affair, silver star, peace corps, common year, bronze star, arctic char, rectilinear, limited war, screen door, ichthyosaur, account for, health care, vanity fair, interlinear, douglas fir, balsam pear, mexican war, potty chair, basket star, double star, vietnam war, fiscal year, french door, flying mare, six day war, touring car, file server, king arthur, port arthur

12 letters:
morris chair, evening star, sleeping car, barking deer, bill of fare, morning star, blazing star, wrecking bar, camel's hair, ground floor, magic square, folding door, landing gear, feather star, state of war, grizzly bear, internal ear, iceland spar, belgian hare, times square, white squire, bevel square, external ear, neutron star, prickly pear, sloop of war, steel guitar, brittle star, marine corps, elephant ear, liquor store, anchovy pear, swivel chair, avocado pear, latin square, restaurateur, soup du jour, germ warfare

13 letters:
virginia deer, nom de guerre, lord's prayer, wear and tear, laissez faire, multiple star, snowshoe hare, calendar year, louis pasteur, questionnaire, academic year, passenger car, steering gear, crystal clear, rocking chair, general store, cinnamon bear, package store, force majeure, conventioneer, rouge et noir, variable star, shooting star, tropical year, windsor chair, grocery store, class warfare

14 letters:
evening prayer, financial year, civil engineer, planetary gear, alligator pear, hardware store, concessionaire, discount store, morning prayer, cervical smear, compressed air, horizontal bar, walking on air, electric chair, life preserver, process-server

15 letters:
hawaiian guitar, croix de guerre, first world war, cauliflower ear, sabbatical year, black marketeer, acoustic guitar, flight engineer, prisoner of war, esprit de corps, electric guitar, reasonable care

16 letters:
second world war, celestial sphere, department store, diplomatic corps, chemical warfare

17 letters:
astronomical year, differential gear, thirty years' war, convenience store, peloponnesian war, castle in the air, chester a. arthur

18 letters:
hundred years' war, american civil war, biological warfare, electronic warfare

19 letters:
mechanical engineer, electrical engineer, chester alan arthur

21 letters:
delusions of grandeur, book of common prayer, dedicated file server, psychological warfare

22 letters:
accommodation endorser