disintegration vs decay

disintegration and decay both are nouns.

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

As nouns, disintegration and decay are synonyms defined as:

disintegration and decay: the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation

Other synonyms of disintegration include radioactive decay.

As nouns, decay is a hypernym of disintegration; that is, decay is a word with a broader meaning than disintegration:

disintegration (noun)	decay (noun)
total destruction	the organic phenomenon of rotting
separation into component parts	a gradual decrease; as of stored charge or current
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation	the process of gradually becoming inferior
in a decomposed state	the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
a loss (or serious disruption) of organization in some system	an inferior state resulting from the process of decaying

disintegration (verb)	decay (verb)
	fall into decay or ruin
	lose a stored charge, magnetic flux, or current
	undergo decay or decomposition