bluetongue vs catarrhal fever

bluetongue and catarrhal fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluetongue	Yes	No	No	No
catarrhal fever	Yes	No	No	No

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

bluetongue: a viral disease of sheep and cattle that is transmitted by biting midges
catarrhal fever: any of several disease of livestock marked by fever and edema of the respiratory tract

bluetongue (noun)	catarrhal fever (noun)
a viral disease of sheep and cattle that is transmitted by biting midges	any of several disease of livestock marked by fever and edema of the respiratory tract