Vindicate = (verb) justify, substantiate, confirm.

• Vindicate a claim.
• Vindicate one’s title to a claim.
• Vindicate the veracity of one’s judgement.
• Events have vindicated his judgement/action.
• These discoveries vindicate his theories.
• (2) To clear of accusation ,blame or doubt with supporting argument/proof.
• He will be completely vindicated by the evidence.
• He felt vindicated when the truth became known.

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Vindictive = (adjective) unforgiving ,vengeful, disposed to seek revenge.

• He’s a vindictive man.
• Her mother-in-law is a vindictive woman who burned all her clothes.
• ‘ Why are you so vindictive towards me’   she said.
• The vindictiveness of the two brothers caused them to constantly fight.
• She thinks I’m very crazy and vindictive.