breakbone fever vs dengue

breakbone fever and dengue both are nouns.

Word	Noun	Adjective	Verb	Adverb
breakbone fever	Yes	No	No	No
dengue	Yes	No	No	No

As nouns, breakbone fever and dengue are synonyms defined as:

breakbone fever and dengue: an infectious disease of the tropics transmitted by mosquitoes and characterized by rash and aching head and joints

Other synonyms of breakbone fever include dandy fever, dengue fever.

breakbone fever (noun)	dengue (noun)
an infectious disease of the tropics transmitted by mosquitoes and characterized by rash and aching head and joints	an infectious disease of the tropics transmitted by mosquitoes and characterized by rash and aching head and joints