sink in vs infiltrate

sink in and infiltrate both are verbs.

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

As verbs, infiltrate is a hyponym of sink in; that is, infiltrate is a word with a more specific, narrower meaning than sink in:

sink in (verb)	infiltrate (verb)
become clear or enter one's consciousness or emotions	pass through an enemy line; in a military conflict
pass through	cause (a liquid) to enter by penetrating the interstices
	pass into or through by filtering or permeating
	enter a group or organization in order to spy on the members