Synonyms and related words :
case of need, climacteric, clutch, compulsion, constraint, contingency, convergence of events, crisis, critical juncture, critical point, crossroads, crucial period, crunch, demandingness, dire necessity, drive, emergency, exigence, extremity, high pressure, hinge, immediacy, imperative, imperativeness, importunacy, importunateness, importunity, impulse, impulsion, insistence, matter of necessity, pass, persistence, pertinaciousness, pertinacity, pinch, predicament, press, pressingness, pressure, push, rash impulse, rub, strait, stress, tension, turn, turning, turning point, urge, urgency, urgent need