festering vs body fluid

festering and body fluid both are nouns.

Word	Noun	Adjective	Verb	Adverb
festering	Yes	No	No	No
body fluid	Yes	No	No	No

As nouns, body fluid is a hypernym of festering; that is, body fluid is a word with a broader meaning than festering:

Other hypernyms of festering include bodily fluid, humor, humour, liquid body substance.

festering (noun)	body fluid (noun)
a fluid product of inflammation	the liquid parts of the body
(medicine) the formation of morbific matter in an abscess or a vesicle and the discharge of pus