What is another word for "opening"?

Roget's Thesaurus (1911) lists these synonyms for "opening": abra, absence, abysm, abyss, ant, avoid, avoidance, avolation, away, bacon, barranca, belle, between, bird, border, breach, breachy, break, brim, brink, brow, caesura, call, canon, chap, chaps, chasm, chink, chops, clear, cleft, close, clove, coast, collar, come, confine, conjuncture, coop, crack.