dilapidate vs decay

dilapidate is not a noun while decay is a noun.

Word	Noun	Adjective	Verb	Adverb
dilapidate	No	No	Yes	No
decay	Yes	No	Yes	No

As verbs, dilapidate and decay are synonyms defined as:

Other synonyms of dilapidate include crumble.

dilapidate (noun)	decay (noun)
	the organic phenomenon of rotting
	a gradual decrease; as of stored charge or current
	the process of gradually becoming inferior
	the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
	an inferior state resulting from the process of decaying

dilapidate (verb)	decay (verb)
fall into decay or ruin	fall into decay or ruin
bring into a condition of decay or partial ruin by neglect or misuse	lose a stored charge, magnetic flux, or current
	undergo decay or decomposition