ill will vs enmity

ill will and enmity both are nouns.

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

As nouns, ill will and enmity are synonyms defined as:

Other synonyms of ill will include hostility.

ill will (noun)	enmity (noun)
a hostile (very unfriendly) disposition	the feeling of a hostile person
the feeling of a hostile person	a state of deep-seated ill-will