typhus vs typhus fever

typhus and typhus fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
typhus	Yes	No	No	No
typhus fever	Yes	No	No	No

As nouns, typhus and typhus fever are synonyms defined as:

typhus and typhus fever: rickettsial disease transmitted by body lice and characterized by skin rash and high fever

typhus (noun)	typhus fever (noun)
rickettsial disease transmitted by body lice and characterized by skin rash and high fever	rickettsial disease transmitted by body lice and characterized by skin rash and high fever