pulmonary stenosis vs stricture

pulmonary stenosis and stricture both are nouns.

Word	Noun	Adjective	Verb	Adverb
pulmonary stenosis	Yes	No	No	No
stricture	Yes	No	No	No

As nouns, stricture is a hypernym of pulmonary stenosis; that is, stricture is a word with a broader meaning than pulmonary stenosis:

pulmonary stenosis: abnormal narrowing of the opening into the pulmonary artery from the right ventricle
stricture: abnormal narrowing of a bodily canal or passageway

Other hypernyms of pulmonary stenosis include stenosis.

pulmonary stenosis (noun)	stricture (noun)
abnormal narrowing of the opening into the pulmonary artery from the right ventricle	severe criticism
	abnormal narrowing of a bodily canal or passageway