deer fly fever vs zoonosis

deer fly fever and zoonosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
deer fly fever	Yes	No	No	No
zoonosis	Yes	No	No	No

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

deer fly fever: a highly infectious disease of rodents (especially rabbits and squirrels) and sometimes transmitted to humans by ticks or flies or by handling infected animals
zoonosis: an animal disease that can be transmitted to humans

Other hypernyms of deer fly fever include zoonotic disease.

deer fly fever (noun)	zoonosis (noun)
a highly infectious disease of rodents (especially rabbits and squirrels) and sometimes transmitted to humans by ticks or flies or by handling infected animals	an animal disease that can be transmitted to humans