penetralium vs inside

penetralium and inside both are nouns.

Word	Noun	Adjective	Verb	Adverb
penetralium	Yes	No	No	No
inside	Yes	Yes	No	Yes

As nouns, inside is a hypernym of penetralium; that is, inside is a word with a broader meaning than penetralium:

Other hypernyms of penetralium include interior.

penetralium (noun)	inside (noun)
the innermost parts	the inner or enclosed surface of something
	the region that is inside of something

penetralium (adjective)	inside (adjective)
	relating to or being on the side closer to the center or within a defined space
	confined to an exclusive group
	away from the outer edge
	being or applying to the inside of a building

penetralium (adverb)	inside (adverb)
	within a building
	on the inside
	in reality
	with respect to private feelings