rot vs gangrene

rot and gangrene both are nouns.

Word	Noun	Adjective	Verb	Adverb
rot	Yes	No	Yes	No
gangrene	Yes	No	Yes	No

As verbs, gangrene is a hyponym of rot; that is, gangrene is a word with a more specific, narrower meaning than rot:

Other hyponyms of rot include mortify, necrose, sphacelate.

rot (noun)	gangrene (noun)
unacceptable behavior (especially ludicrously false statements)	the localized death of living cells (as from infection or the interruption of blood supply)
(biology) the process of decay caused by bacterial or fungal action	necrotic tissue; a mortified or gangrenous part or mass
a state of decay usually accompanied by an offensive odor

rot (verb)	gangrene (verb)
become physically weaker	undergo necrosis
break down