Nouns

(n)gangrene, sphacelus, slough1necrotic tissue; a mortified or gangrenous part or mass
(n)necrosis, mortification, gangrene, sphacelusthe localized death of living cells (as from infection or the interruption of blood supply)

Verbs

(v)necrose, gangrene, mortify, sphacelateundergo necrosis“the tissue around the wound necrosed”