Riggs' disease vs pyorrhea alveolaris

Riggs' disease and pyorrhea alveolaris both are nouns.

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

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

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

Other synonyms of Riggs' disease include pyorrhea, pyorrhoea.

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