Synonyms of 'critical point'

bench mark, climacteric, climax, clutch, Core, cornerstone, crisis, crunch, Crux, emergency, essence, essential, exigency, extremity, fundamental, gist, gravamen, heart, high point, hinge, issue, kernel, keystone, landmark, meat, milestone, nub, pass, pinch, pith, pivot, push, rub, sine qua non, strait, substance, turn, turning point