sink in vs filter

sink in is not a noun while filter is a noun.

Word	Noun	Adjective	Verb	Adverb
sink in	No	No	Yes	No
filter	Yes	No	Yes	No

As verbs, sink in and filter are synonyms defined as:

Other synonyms of sink in include percolate, permeate.

sink in (noun)	filter (noun)
	device that removes something from whatever passes through it
	an electrical device that alters the frequency spectrum of signals passing through it

sink in (verb)	filter (verb)
become clear or enter one's consciousness or emotions	remove by passing through a filter
pass through	pass through
	run or flow slowly, as in drops or in an unsteady stream