festering vs purulence

festering and purulence both are nouns.

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

As nouns, festering and purulence are synonyms defined as:

Other synonyms of festering include ichor, pus, sanies, suppuration.

festering (noun)	purulence (noun)
a fluid product of inflammation	a fluid product of inflammation
(medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus	symptom of being purulent (containing or forming pus)