autoimmune vs autoimmunity

autoimmune is not a noun while autoimmunity is a noun.

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

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

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