chasm, disparity, deficit, imbalance, gulf, shortfall, divide, void, mismatch, discrepancy, difference, rift, inequalities, lacuna, yawning, loophole, fissure, inequities, disconnect, differential, divergence, lag, disadvantage, hole, disproportion, schism, bridging, barriers, chink, balance, bottleneck, surplus, blackhole, narrowing, stopgap, deficiency, squeeze, shortage, disjuncture, unbalance, disjunction, margin, overlap, problem, dichotomy, logjam, maldistribution, cushion, contradiction, shortcoming, deadlock, misalignment, cracks, leapfrog, frame, incongruence, parity, dissimilarities, nots, similarity, tightrope, direct correlation, misunderstanding, crunch, potholes, gash, discontinuity, stalemate, loop, surpluses, achilles heel, splits, conundrum, sinkhole, disproportionality, flaw, achievement, gapes, lopsidedness, paradox, vacancy, gender gap, asymmetry, inconsistencies, lead, stretch, impasse, advantage, floodgates, bulge, sparsity, weaknesses, arrears, miscommunication, mistrust, interstices, dearth, horizons, span, boost, between, squandering, gaps, disparities, differentials, breach, discrepancies, drain, drawback, hiatus, force, protection, bonding, distribution, ic, tive, additive, barrier, entropy, inhomogeneous, nonsymmetric, unworkable, antiferromagnetic, equilibrium, homogeneous, impedance, laminar, modified, monomolecular

abruption, barracking, blank, breach, breaking off, chasm, cleft, crack, crevice, fissure, foramen, heckling, hole, interjection, interpolation, interposition, lacuna, mouth, rent, rift, rip, scissure, split, tear, water gap, window, wind gap

., arc lamp, arc light, blank, breach, broken arch, closing, closure, distance, fontanel, fontanelle, gap-toothed, hiatus, hollow, lacuna, length, myelomeningocele, piston ring, poor, rift, soft spot, spark gap, spark transmitter

earth's surface, surface

delay, detention, disparity, holdup, mountain pass, notch, open, opening, open up, pass, space

breach, break, col, crack, disruption, interruption, opening, spread