Riggs' disease vs pyorrhea

Riggs' disease and pyorrhea both are nouns.

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

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

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

Other synonyms of Riggs' disease include pyorrhea alveolaris, pyorrhoea.

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