sodoku vs ratbite fever

sodoku and ratbite fever both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodoku	Yes	No	No	No
ratbite fever	Yes	No	No	No

As nouns, ratbite fever is a hypernym of sodoku; that is, ratbite fever is a word with a broader meaning than sodoku:

sodoku: the form of ratbite fever occurring in the Far East
ratbite fever: either of two infectious diseases transmitted to humans by the bite of a rat or mouse; characterized by fever and headache and nausea and skin eruptions

sodoku (noun)	ratbite fever (noun)
the form of ratbite fever occurring in the Far East	either of two infectious diseases transmitted to humans by the bite of a rat or mouse; characterized by fever and headache and nausea and skin eruptions