apology vs vindication

apology and vindication both are nouns.

Word	Noun	Adjective	Verb	Adverb
apology	Yes	No	No	No
vindication	Yes	No	No	No

As nouns, vindication is a hypernym of apology; that is, vindication is a word with a broader meaning than apology:

Other hypernyms of apology include defence, defense.

apology (noun)	vindication (noun)
a poor example	the act of vindicating or defending against criticism or censure etc.
an expression of regret at having caused trouble for someone	the justification for some act or belief
a formal written defense of something you believe in strongly