pyorrhea vs Riggs' disease

pyorrhea and Riggs' disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyorrhea	Yes	No	No	No
Riggs' disease	Yes	No	No	No

As nouns, pyorrhea and Riggs' disease are synonyms defined as:

pyorrhea and Riggs' disease: chronic periodontitis; purulent inflammation of the teeth sockets

Other synonyms of pyorrhea include pyorrhea alveolaris, pyorrhoea.

pyorrhea (noun)	Riggs' disease (noun)
discharge of pus	chronic periodontitis; purulent inflammation of the teeth sockets
chronic periodontitis; purulent inflammation of the teeth sockets