entry vs penetration

entry and penetration both are nouns.

Word	Noun	Adjective	Verb	Adverb
entry	Yes	No	No	No
penetration	Yes	No	No	No

As nouns, penetration is a hyponym of entry; that is, penetration is a word with a more specific, narrower meaning than entry:

entry (noun)	penetration (noun)
the act of entering	an attack that penetrates into enemy territory
the act of beginning something new	the act of entering into or through something
something that provides access (to get in or get out)	the act (by a man) of inserting his penis into the vagina of a woman
something (manuscripts or architectural plans and models or estimates or works of art of all genres etc.) submitted for the judgment of others (as in a competition)	the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
an item inserted in a written record	the ability to make way into or through something
a written record of a commercial transaction	clear or deep perception of a situation