What is another word for "lacuna"?

Roget's Thesaurus (1911) lists these synonyms for "lacuna": abra, absence, abysm, abyss, arrear, barranca, between, breach, breachy, break, caesura, canon, caret, chap, chasm, chink, cleft, clove, complete, crack, cranny, creek, crevasse, crevice, crude, cut, defalcation, default, defect, defective, deficiency, deficient, deficit, defile, dike, discontinuity, failing, fall, far, fissure.