respiratory disorder vs disease

respiratory disorder and disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
respiratory disorder	Yes	No	No	No
disease	Yes	No	No	No

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

respiratory disorder (noun)	disease (noun)
a disease affecting the respiratory system	an impairment of health or a condition of abnormal functioning