vindication vs apologia

vindication and apologia both are nouns.

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

As nouns, apologia is a hyponym of vindication; that is, apologia is a word with a more specific, narrower meaning than vindication:

Other hyponyms of vindication include apology, alibi, alibi, exculpation, excuse, self-justification.

vindication (noun)	apologia (noun)
the act of vindicating or defending against criticism or censure etc.	a formal written defense of something you believe in strongly
the justification for some act or belief