remorse vs penance

remorse and penance both are nouns.

Word	Noun	Adjective	Verb	Adverb
remorse	Yes	No	No	No
penance	Yes	No	No	No

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

Other hyponyms of remorse include guilt, guilt feelings, guilt trip, guilty conscience, penitence, repentance.

remorse (noun)	penance (noun)
a feeling of deep regret (usually for some misdeed)	voluntary self-punishment in order to atone for some wrongdoing
	a Catholic sacrament; repentance and confession and atonement and absolution
	remorse for your past conduct