rickettsiosis vs rickettsial disease

rickettsiosis and rickettsial disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
rickettsiosis	Yes	No	No	No
rickettsial disease	Yes	No	No	No

As nouns, rickettsiosis and rickettsial disease are synonyms defined as:

rickettsiosis and rickettsial disease: infectious disease caused by ticks or mites or body lice infected with rickettsial bacteria

rickettsiosis (noun)	rickettsial disease (noun)
infectious disease caused by ticks or mites or body lice infected with rickettsial bacteria	infectious disease caused by ticks or mites or body lice infected with rickettsial bacteria