yellow jack vs yellow fever

yellow jack and yellow fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow jack	Yes	No	No	No
yellow fever	Yes	No	No	No

As nouns, yellow jack and yellow fever are synonyms defined as:

yellow jack and yellow fever: caused by a flavivirus transmitted by a mosquito

Other synonyms of yellow jack include black vomit.

yellow jack (noun)	yellow fever (noun)
fish of western Atlantic and Gulf of Mexico, also known as the coolihoo (Caranx bartholomaei)	caused by a flavivirus transmitted by a mosquito
yellow flag hoist on a ship in quarantine
caused by a flavivirus transmitted by a mosquito