autoimmunity vs autoimmune

autoimmunity is a noun but autoimmune is not a noun.

Word	Noun	Adjective	Verb	Adverb
autoimmunity	Yes	No	No	No
autoimmune	No	Yes	No	No

autoimmunity (noun)	autoimmune (noun)
production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions

autoimmunity (adjective)	autoimmune (adjective)
	of or relating to the immune response of the body against substance normally present in the body