pyorrhoea vs pyorrhea

pyorrhoea and pyorrhea both are nouns.

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

As nouns, pyorrhoea and pyorrhea are synonyms defined as:

As nouns, pyorrhoea and pyorrhea are synonyms defined as:

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

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

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