What is another word for "canon"?

Roget's Thesaurus (1911) lists these synonyms for "canon": abra, absence, abysm, abyss, act, barranca, between, breach, breachy, break, caesura, chap, charge, chasm, chink, cleft, clove, code, command, corpus, crack, cranny, creek, crevasse, crevice, cut, defile, dike, direction, far, fissure, flaw, form, formula, formulary, frith, furrow, gap, gape, gash.