breakbone fever vs dandy fever

breakbone fever and dandy fever both are nouns.

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

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

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

Other synonyms of breakbone fever include dengue, dengue fever.

breakbone fever (noun)	dandy fever (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