moulder vs rot

moulder is not a noun while rot is a noun.

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

As verbs, moulder and rot are synonyms defined as:

Other synonyms of moulder include decompose, molder.

moulder (noun)	rot (noun)
	unacceptable behavior (especially ludicrously false statements)
	(biology) the process of decay caused by bacterial or fungal action
	a state of decay usually accompanied by an offensive odor

moulder (verb)	rot (verb)
break down	become physically weaker
	break down