necrosis vs sphacelus

necrosis and sphacelus both are nouns.

Word	Noun	Adjective	Verb	Adverb
necrosis	Yes	No	No	No
sphacelus	Yes	No	No	No

As nouns, necrosis and sphacelus are synonyms defined as:

necrosis and sphacelus: the localized death of living cells (as from infection or the interruption of blood supply)

Other synonyms of necrosis include gangrene, mortification.

necrosis (noun)	sphacelus (noun)
the localized death of living cells (as from infection or the interruption of blood supply)	the localized death of living cells (as from infection or the interruption of blood supply)
	necrotic tissue; a mortified or gangrenous part or mass