sandfly fever vs pappataci fever

sandfly fever and pappataci fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
sandfly fever	Yes	No	No	No
pappataci fever	Yes	No	No	No

As nouns, sandfly fever and pappataci fever are synonyms defined as:

sandfly fever and pappataci fever: a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii

Other synonyms of sandfly fever include phlebotomus.

sandfly fever (noun)	pappataci fever (noun)
a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii	a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii