Answer
All three are Civil Code damages with different purposes. Moral damages (Article 2217) compensate non-physical injury; nominal damages (Article 2221) vindicate a right where no measurable loss was proved; exemplary damages (Article 2229) are imposed for the public good, always in addition to another category and never as a matter of right (Article 2233).
A key link: the plaintiff must first establish entitlement to moral, temperate, or compensatory damages before exemplary damages may be awarded (Article 2234). For all of them, no proof of pecuniary loss is required (Article 2216).
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