sink vs sinking

sink and sinking both are nouns.

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

sink (noun)	sinking (noun)
plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe	a descent as through liquid (especially through water)
a covered cistern; waste water and sewage flow into it	a slow fall or decline (as for lack of strength)
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof	a feeling caused by uneasiness or apprehension
(technology) a process that acts to absorb or remove energy or a substance from a system

sink (verb)	sinking (verb)
fall heavily or suddenly; decline markedly
embed deeply
go under
fall or descend to a lower place or level
cause to sink
fall or sink heavily
appear to move downward
descend into or as if into some soft substance or place
pass into a specified state or condition; sink into