purulence vs festering

purulence and festering both are nouns.

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

As nouns, purulence and festering are synonyms defined as:

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

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