Synonyms and related words :
balefulness, banefulness, communicability, contagiousness, deadliness, destructiveness, detrimentalness, harmfulness, hurtfulness, infectiousness, infectivity, injuriousness, lethality, malignance, malignancy, malignity, mischievousness, noisomeness, noxiousness, ominousness, perniciousness, poison, poisonousness, unhealthiness, venom, venomousness, viciousness, virulence, virulency