What is another word for "abyss"?

Roget's Thesaurus (1911) lists these synonyms for "abyss": abra, absence, abysm, and, barranca, below, between, bottomless, breach, breachy, break, brimstone, caesura, canon, chap, chasm, chink, cleft, clove, crack, cranny, creek, crevasse, crevice, cut, damnation, defile, dike, eternal, everlasting, fallen, far, fire, fissure, flaw, frith, furrow, gap, gape, gash.