deepness vs penetration

deepness and penetration both are nouns.

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

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

deepness: the extent downward or backward or inward
penetration: the depth to which something penetrates (especially the depth reached by a projectile that hits a target)

Other hyponyms of deepness include deepness, profoundness, profundity, draft, draught, sounding, shallowness.

deepness (noun)	penetration (noun)
the quality of being physically deep	an attack that penetrates into enemy territory
the extent downward or backward or inward	the act of entering into or through something
a low pitch that is loud and voluminous	the act (by a man) of inserting his penis into the vagina of a woman
the intellectual ability to penetrate deeply into ideas	the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
	the ability to make way into or through something
	clear or deep perception of a situation