bacillary dysentery vs shigellosis

bacillary dysentery and shigellosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
bacillary dysentery	Yes	No	No	No
shigellosis	Yes	No	No	No

As nouns, bacillary dysentery and shigellosis are synonyms defined as:

bacillary dysentery and shigellosis: an acute infection of the intestine by shigella bacteria; characterized by diarrhea and fever and abdominal pains

bacillary dysentery (noun)	shigellosis (noun)
an acute infection of the intestine by shigella bacteria; characterized by diarrhea and fever and abdominal pains	an acute infection of the intestine by shigella bacteria; characterized by diarrhea and fever and abdominal pains