call back, call up, disengage, free, loosen up, recall, recollect, release, remember, remind, retrieve, think, unblock, unfreeze, unstuff

cylinder, piston chamber, sector

gumwood, flintwood, krameria, seventh avenue, alley, bock, sweetbrier, huisache, candleberry, prowler, curb, corner, duplex, lemonwood, avenues, residence, blvd, intersection, getwell, apartment, cul de sac, driveway, hangup, rowhouse, triplex, fourplex, beechnut, summerwood, caller, disturbance, townhouse, nutwood, jemmy, search warrant, upas, culdesac, front porch, rob, placita, stop, carport, backdoor, subdivision, starflower, soncy, expy, shagbark, pavonia, scupper, deadend, sugarberry, cottonade, neighborhood, carjack, burglary, avenida, bonair, plex, porch, frontage road, wickiup, knock, corral, sweetbriar, peachwood, deputies, trl, offramp, superblock, ditch, sweet gum, midnight, tia juana, waterleaf, chalkstone, misdial, egresses, overcrossing, oldsmobile, sidewalk, inside, skinker, blocker, lonas, ram, alleyway, passerby, neighbor, dfc, rooming house, house, tpke, gin mill, pepperidge, bedroom, lancewood, switchblade knife, ebbtide, quadruplex, hashmark, evernia, brick, blocks, frame, bridge, cluster, stack, stake, building, chunk, bin, bolt, cube, line, piece, plank, single, swing, anchor, bar, chip, column, plan, simpler, box, modular, layout, slab, rise, checkerboard, curvilinear, hexagonal, pyramid, boxlike, concrete, control, counting, image, metre, newest, palladian

anvil, back up, bad block, bar, barricade, barricado, blockade, block off, block of metal, block out, bollock, bottleneck, breechblock, breech closer, briquet, briquette, bullock block, cake, cellblock, check, chock, choke, choke off, chopping block, clog, clog up, close, close off, congest, crosshead, cube, dam, dam up, domino, earth up, embargo, fairlead, filibuster, foul, goldbrick, hang, hospital ward, idler pulley, idle pulley, idle wheel, ingot, inking pad, inkpad, land up, metal bar, nog, nut, pad, plug, screen, shut off, slab, square block, stamp pad, starting block, stay, stonewall, stopper, stopple, suffocate, swage block, trap block, type, vapor lock, vapour lock, ward, wedge, writer's block

., alpha-adrenergic blocker, alpha-adrenergic blocking agent, alpha-blocker, alpha blocker, anti-tnf compound, anvil, ashlar, attached, bad block, bar, barricade, barricado, battle of the philippine sea, blockbuster, blocker, blocking agent, blockish, blocky, block grant, block off, block of metal, block out, bollock, breechblock, breech closer, breeze block, brick, briquet, briquette, buff, buffer, building block, bullock block, cake, calcium-channel blocker, calcium blocker, check, check character, chock, chock-a-block, chopping block, cinder block, clinker block, close off, close up, cox-1, cox-2, crosshead, cube, damper block, domino, drawbridge, earth up, easy, engrave, engraving, fairlead, fender, flutter, goldbrick, gregory goodwin pincus, gregory pincus, headstone, hospital ward, hydraulically, impede, ineffectual, ingot, inking pad, inkpad, intellectualisation, intellectualization, jam, key, keystone, land up, latency, lift bridge, linecut, line block, line engraving, linocut, masking, masking piece, massif, metal bar, neapolitan ice cream, nog, nuclear winter, nut, obstruct, obturate, occlude, ozone layer, ozonosphere, pad, parsons table, periarteritis nodosa, philippine sea, piano damper, pig, pillow block, pincus, polyarteritis nodosa, quad, rack, radiator hose, rotational latency, sabot, scribbling block, sculpt, shut off, slab, snatch block, sociably, space, square block, stamp, stamp pad, starting block, step, swage block, thiazide, trap block, type, vapor lock, vapour lock, voussoir, ward, water jacket, wedge, wing, woodcut, wooden shoe, wood block, wood engraving, writer's block

block and tackle, football, internal-combustion engine, reciprocating engine

accumulation, aggregation, anesthesize, area, artefact, artifact, assemblage, back up, boss, break up, cast, casting, choke, choke off, clog, clog up, collection, computer memory unit, conceal, congest, country, cut off, disrupt, emboss, fence, forbid, foreclose, forestall, form, foul, hide, hinder, hold, hold up, housing, impede, impediment, impedimenta, inability, interrupt, keep back, lodging, machine, obstruction, operate, platform, preclude, prevent, run, shape, simple machine, solid, stamp, support, sustain, withhold

auction block, bar, barricade, blank out, block off, block up, blockade, blockage, blocking, choke up, city block, close up, closure, cube, cylinder block, deflect, draw a blank, embarrass, engine block, forget, freeze, halt, hinder, immobilize, impede, interference, jam, kibosh, lug, mental block, obstruct, occlude, occlusion, parry, pulley, pulley-block, stop, stoppage, stuff, stymie, stymy