sneak in vs penetrate

sneak in and penetrate both are verbs.

Word	Noun	Adjective	Verb	Adverb
sneak in	No	No	Yes	No
penetrate	No	No	Yes	No

As verbs, penetrate is a hypernym of sneak in; that is, penetrate is a word with a broader meaning than sneak in:

Other hypernyms of sneak in include perforate.

sneak in (verb)	penetrate (verb)
insert casually	come to understand
enter surreptitiously	become clear or enter one's consciousness or emotions
	pass into or through, often by overcoming resistance
	insert the penis into the vagina or anus of
	spread or diffuse through
	make one's way deeper into or through
	enter a group or organization in order to spy on the members