festering vs gleet

festering and gleet both are nouns.

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

As nouns, gleet is a hyponym of festering; that is, gleet is a word with a more specific, narrower meaning than festering:

festering: a fluid product of inflammation
gleet: a thin morbid discharge as from a wound or especially chronic gonorrhea

festering (noun)	gleet (noun)
a fluid product of inflammation	a thin morbid discharge as from a wound or especially chronic gonorrhea
(medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus