climacterics, climaxes, corners, landmarks, mileposts, milestones, watersheds

breaks, cappers, clinchers, crushers, highlights, toppersconversions, metamorphoses, transfigurations, transformations, turnabouts, turnaroundsboiling points, breaking points, clutches, conjunctures, crises, crossroads, crunches, crunch times, Dunkirks, emergencies, exigencies, extremities, flash points, heads, junctures, zero hours