Synonyms and related words :
absence, awayness, blank, deprivation, emptiness, lack, negation, negativeness, negativity, neverness, nihility, nonbeing, nonentity, nonexistence, nonpresence, nonreality, nonsubsistence, not-being, nothingness, nowhereness, nullity, subtraction, unactuality, unreality, vacancy, vacuity, vacuum, void, want