hydronephrosis vs pathology

hydronephrosis and pathology both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydronephrosis	Yes	No	No	No
pathology	Yes	No	No	No

As nouns, pathology is a hypernym of hydronephrosis; that is, pathology is a word with a broader meaning than hydronephrosis:

hydronephrosis: accumulation of urine in the kidney because of an obstruction in the ureter
pathology: any deviation from a healthy or normal condition

hydronephrosis (noun)	pathology (noun)
accumulation of urine in the kidney because of an obstruction in the ureter	the branch of medical science that studies the causes and nature and effects of diseases
	any deviation from a healthy or normal condition