Synonyms and related words :
adaptability, adjustability, alterability, brevity, briefness, changeability, changeableness, changefulness, compactness, compendiousness, conciseness, curtness, death rate, death toll, flexibility, fluidity, impermanence, instantaneousness, littleness, lowness, malleability, mobility, modifiability, mortality, mortalness, movability, mutability, nonuniformity, permutability, plasticity, resilience, rubberiness, short time, shortness, succinctness, summariness, suppleness, transitoriness