virulence vs harmfulness

virulence and harmfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
virulence	Yes	No	No	No
harmfulness	Yes	No	No	No

As nouns, harmfulness is a hypernym of virulence; that is, harmfulness is a word with a broader meaning than virulence:

virulence: extreme harmfulness (as the capacity of a microorganism to cause disease)
harmfulness: destructiveness that causes harm or injury

Other hypernyms of virulence include injuriousness.

virulence (noun)	harmfulness (noun)
extreme harmfulness (as the capacity of a microorganism to cause disease)	destructiveness that causes harm or injury
extreme hostility	the quality of being noxious