1 blank, breach, break, breathing space, chink, cleft, crack, cranny, crevice, discontinuity, divide, entr'acte, hiatus, hole, interlude, intermission, interruption, interstice, interval, lacuna, lull, opening, pause, recess, rent, respite, rift, space, vacuity, void
2 difference, disagreement, disparity, divergence, inconsistency