decline vs decay

decay vs decline

decline and decay both are nouns.

decline and decay both are verbs.

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

As nouns, decline and decay are synonyms defined as:

decline and decay: a gradual decrease; as of stored charge or current

decline (noun)	decay (noun)
a downward slope or bend	the organic phenomenon of rotting
a gradual decrease; as of stored charge or current	a gradual decrease; as of stored charge or current
change toward something smaller or lower	the process of gradually becoming inferior
a condition inferior to an earlier condition; a gradual falling off from a better state; decline	the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
	an inferior state resulting from the process of decaying

decline (verb)	decay (verb)
grow smaller	fall into decay or ruin
grow worse	lose a stored charge, magnetic flux, or current
show unwillingness towards	undergo decay or decomposition
inflect for number, gender, case, etc.
go down
fall in value
not accept as true

Difference between decline and decay

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