filter vs sink in

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

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

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

Other synonyms of filter include percolate, permeate.

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

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