purulency vs purulence

purulency and purulence both are nouns.

Word	Noun	Adjective	Verb	Adverb
purulency	Yes	No	No	No
purulence	Yes	No	No	No

As nouns, purulency and purulence are synonyms defined as:

purulency and purulence: symptom of being purulent (containing or forming pus)

purulency (noun)	purulence (noun)
symptom of being purulent (containing or forming pus)	a fluid product of inflammation
	symptom of being purulent (containing or forming pus)