Lyme arthritis vs zoonosis

Lyme arthritis and zoonosis both are nouns.

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

As nouns, zoonosis is a hypernym of Lyme arthritis; that is, zoonosis is a word with a broader meaning than Lyme arthritis:

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
zoonosis: an animal disease that can be transmitted to humans

Other hypernyms of Lyme arthritis include zoonotic disease.

Lyme arthritis (noun)	zoonosis (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 animal disease that can be transmitted to humans