Nouns

(n)putrefaction, rota state of decay usually accompanied by an offensive odor
(n)decomposition, rot, rotting, putrefaction, breakdown(biology) the process of decay caused by bacterial or fungal action
(n)bunk, bunkum, buncombe, guff, rot, hogwashunacceptable behavior (especially ludicrously false statements)

Verbs

(v)decompose, rot, molder, moulderbreak down“The bodies decomposed in the heat”
(v)waste, rotbecome physically weaker“Political prisoners are wasting away in many prisons all over the world”