respiratory illness vs coughing

respiratory illness and coughing both are nouns.

Word	Noun	Adjective	Verb	Adverb
respiratory illness	Yes	No	No	No
coughing	Yes	No	No	No

respiratory illness (noun)	coughing (noun)
a disease affecting the respiratory system	a sudden noisy expulsion of air from the lungs that clears the air passages; a common symptom of upper respiratory infection or bronchitis or pneumonia or tuberculosis