rue vs compunction

rue and compunction both are nouns.

Word	Noun	Adjective	Verb	Adverb
rue	Yes	No	Yes	No
compunction	Yes	No	No	No

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

Other hyponyms of rue include attrition, contriteness, contrition, remorse, self-reproach.

rue (noun)	compunction (noun)
(French) a street or road in France	a feeling of deep regret (usually for some misdeed)
sadness associated with some wrong done or some disappointment
leaves sometimes used for flavoring fruit or claret cup but should be used with great caution: can cause irritation like poison ivy
European strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy

rue (verb)	compunction (verb)
feel remorse for; feel sorry for; be contrite about