apology vs apologia

apology and apologia both are nouns.

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

As nouns, apology and apologia are synonyms defined as:

apology and apologia: a formal written defense of something you believe in strongly

apology (noun)	apologia (noun)
a poor example	a formal written defense of something you believe in strongly
an expression of regret at having caused trouble for someone
a formal written defense of something you believe in strongly