rot

[1]	decay , decompose , fester , spoil , go bad/off , be tainted , be ruined , mould , moulder , putrefy , corrode , rust , disintegrate , deteriorate , crumble/go/fall to pieces
[2]	waste away , wither away , languish , die , moulder , decline , deteriorate , degenerate , decay , atrophy
[3]	decompose , molder , moulder
[4]	waste

[1]	putrefaction
[2]	decomposition , rotting , putrefaction
[3]	bunk , decay , decomposition , bunkum , buncombe , mould , putrefaction , guff , hogwash , putrescence , blight , corrosion , corruption , disintegration , deterioration
[4]	(stuff and) nonsense , balderdash , rubbish , bunkum , tommy-rot , twaddle , drivel , hogwash , eyewash , trash , (Colloq) claptrap , bunk , boloney/boloney , bosh , malarkey , moonshine , poppycock , tosh , (Slang) crap , bull , codswallop , (Brit) (a load of (old) cobblers , (Colloq) balls , bullshit