splenic fever vs zoonosis

splenic fever and zoonosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
splenic fever	Yes	No	No	No
zoonosis	Yes	No	No	No

As nouns, zoonosis is a hypernym of splenic fever; that is, zoonosis is a word with a broader meaning than splenic fever:

splenic fever: a highly infectious animal disease (especially cattle and sheep); it can be transmitted to people
zoonosis: an animal disease that can be transmitted to humans

Other hypernyms of splenic fever include zoonotic disease.

splenic fever (noun)	zoonosis (noun)
a highly infectious animal disease (especially cattle and sheep); it can be transmitted to people	an animal disease that can be transmitted to humans