Lyme disease vs Lyme arthritis

Lyme disease and Lyme arthritis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lyme disease	Yes	No	No	No
Lyme arthritis	Yes	No	No	No

As nouns, Lyme disease and Lyme arthritis are synonyms defined as:

Lyme disease and Lyme arthritis: an acute inflammatory disease characterized by a rash with joint swelling and fever; caused by bacteria carried by the bite of a deer tick

Lyme disease (noun)	Lyme arthritis (noun)
an acute inflammatory disease characterized by a rash with joint swelling and fever; caused by bacteria carried by the bite of a deer tick	an acute inflammatory disease characterized by a rash with joint swelling and fever; caused by bacteria carried by the bite of a deer tick