malaria vs jungle fever

malaria and jungle fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
malaria	Yes	No	No	No
jungle fever	Yes	No	No	No

As nouns, jungle fever is a hyponym of malaria; that is, jungle fever is a word with a more specific, narrower meaning than malaria:

malaria: an infective disease caused by sporozoan parasites that are transmitted through the bite of an infected Anopheles mosquito; marked by paroxysms of chills and fever
jungle fever: severe form of malaria occurring in tropical regions

Other hyponyms of malaria include blackwater fever.

malaria (noun)	jungle fever (noun)
an infective disease caused by sporozoan parasites that are transmitted through the bite of an infected Anopheles mosquito; marked by paroxysms of chills and fever	severe form of malaria occurring in tropical regions