diathesis vs predisposition

diathesis and predisposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
diathesis	Yes	No	No	No
predisposition	Yes	No	No	No

As nouns, predisposition is a hypernym of diathesis; that is, predisposition is a word with a broader meaning than diathesis:

diathesis: constitutional predisposition to a particular disease or abnormality
predisposition: susceptibility to a pathogen

Other hypernyms of diathesis include sensitivity.

diathesis (noun)	predisposition (noun)
constitutional predisposition to a particular disease or abnormality	a disposition in advance to react in a particular way
	an inclination beforehand to interpret statements in a particular way
	susceptibility to a pathogen