pyorrhea vs pyorrhoea

pyorrhea and pyorrhoea both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyorrhea	Yes	No	No	No
pyorrhoea	Yes	No	No	No

As nouns, pyorrhea and pyorrhoea are synonyms defined as:

As nouns, pyorrhea and pyorrhoea are synonyms defined as:

pyorrhea and pyorrhoea: chronic periodontitis; purulent inflammation of the teeth sockets

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

pyorrhea (noun)	pyorrhoea (noun)
discharge of pus	discharge of pus
chronic periodontitis; purulent inflammation of the teeth sockets	chronic periodontitis; purulent inflammation of the teeth sockets