decay vs spoiling

decay and spoiling both are nouns.

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

As nouns, spoiling is a hyponym of decay; that is, spoiling is a word with a more specific, narrower meaning than decay:

decay (noun)	spoiling (noun)
the organic phenomenon of rotting	the act of spoiling something by causing damage to it
a gradual decrease; as of stored charge or current	the process of becoming spoiled
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

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