rheumatic vs rheumatism

rheumatic and rheumatism both are nouns.

Word	Noun	Adjective	Verb	Adverb
rheumatic	Yes	Yes	No	No
rheumatism	Yes	No	No	No

rheumatic (noun)	rheumatism (noun)
a person suffering with rheumatism	any painful disorder of the joints or muscles or connective tissues
	a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint

rheumatic (adjective)	rheumatism (adjective)
of or pertaining to arthritis