pyorrhoea vs pathology

pyorrhoea and pathology both are nouns.

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

As nouns, pathology is a hypernym of pyorrhoea; that is, pathology is a word with a broader meaning than pyorrhoea:

pyorrhoea (noun)	pathology (noun)
discharge of pus	the branch of medical science that studies the causes and nature and effects of diseases
chronic periodontitis; purulent inflammation of the teeth sockets	any deviation from a healthy or normal condition