Synonyms to necessity

absence, AWOL, French leave, abscondence, absence without leave, absentation, absenteeism, absenting, beggary, cut, day off, dearth, default, defect, defectiveness, deficiency, deficit, departure, deprivation, destitution, disappearance, drought, emptiness, escape, excused absence, exigency, famine, fleeing, furlough, holiday, hooky, imperfection, impoverishment, inadequacy, incompleteness, insufficiency, lack, leave, leave of absence, leaving, miss, need, negation, negativeness, negativity, nihility, nonappearance, nonattendance, nonbeing, nonentity, nonexistence, nonoccurrence, nonreality, nonsubsistence, not-being, nothingness, nullity, omission, paucity, privation, running away, sabbatical leave, scantiness, scarcity, shortage, shortcoming, shortfall, sick leave, starvation, truancy, truantism, unactuality, unexcused absence, unreality, vacancy, vacation, vacuity, vacuum, void, want, wantage, act of God, certainty, fate, fatefulness, force majeure, indefeasibility, ineluctability, inescapableness, inevasibleness, inevitability, inevitable accident, inevitableness, inexorability, inflexib