subsidence vs sinking

subsidence and sinking both are nouns.

Word	Noun	Adjective	Verb	Adverb
subsidence	Yes	No	No	No
sinking	Yes	No	No	No

As nouns, sinking is a hypernym of subsidence; that is, sinking is a word with a broader meaning than subsidence:

subsidence (noun)	sinking (noun)
a gradual sinking to a lower level	a descent as through liquid (especially through water)
the sudden collapse of something into a hollow beneath it	a slow fall or decline (as for lack of strength)
an abatement in intensity or degree (as in the manifestations of a disease)	a feeling caused by uneasiness or apprehension