Kawasaki disease vs disease

Kawasaki disease and disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kawasaki disease	Yes	No	No	No
disease	Yes	No	No	No

As nouns, disease is a hypernym of Kawasaki disease; that is, disease is a word with a broader meaning than Kawasaki disease:

Kawasaki disease: an acute disease of young children characterized by a rash and swollen lymph nodes and fever; of unknown cause
disease: an impairment of health or a condition of abnormal functioning

Kawasaki disease (noun)	disease (noun)
an acute disease of young children characterized by a rash and swollen lymph nodes and fever; of unknown cause	an impairment of health or a condition of abnormal functioning