immune vs immunity

immune and immunity both are nouns.

Word	Noun	Adjective	Verb	Adverb
immune	Yes	Yes	No	No
immunity	Yes	No	No	No

immune (noun)	immunity (noun)
a person who is immune to a particular infection	an act exempting someone
	the quality of being unaffected by something
	the state of not being susceptible
	(medicine) the condition in which an organism can resist disease

immune (adjective)	immunity (adjective)
relating to the condition of immunity
secure against
(usually followed by `to') not affected by a given influence
relating to or conferring immunity (to disease or infection)