ill will vs virulency

ill will and virulency both are nouns.

Word	Noun	Adjective	Verb	Adverb
ill will	Yes	No	No	No
virulency	Yes	No	No	No

As nouns, virulency is a hyponym of ill will; that is, virulency is a word with a more specific, narrower meaning than ill will:

Other hyponyms of ill will include virulence.

ill will (noun)	virulency (noun)
a hostile (very unfriendly) disposition	extreme harmfulness (as the capacity of a microorganism to cause disease)
the feeling of a hostile person	extreme hostility