Remorse
Part of speech: noun
Definition: A feeling of regret or sadness for doing wrong or sinning. Sorrow; pity; compassion.
Regret
Part of speech: verb
Definition: To feel sorry about (a thing that has happened): to wish that a thing had not happened, that something else had happened instead.To feel sorry about (any thing).
Part of speech: noun
Definition: The instance of such an emotion.