rickettsial disease vs rickettsiosis

rickettsial disease and rickettsiosis both are nouns.

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

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

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

rickettsial disease (noun)	rickettsiosis (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