Repentant
Part of speech: adjective
Definition: feeling or showing sorrow for wrongdoing
Penitent
Part of speech: adjective
Definition: Feeling pain or sorrow on account of sins or offenses; repentant; contrite; sincerely affected by a sense of guilt, and resolved on amendment of life.Doing penance.
Part of speech: noun
Definition: One who repents of sin; one sorrowful on account of his transgressions.One under church censure, but admitted to penance; one undergoing penance.One under the direction of a confessor.