apologize vs apology

apologize is not a noun while apology is a noun.

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

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

apologize (verb)	apology (verb)
acknowledge faults or shortcomings or failing
defend, explain, clear away, or make excuses for by reasoning