apology vs illustration

apology and illustration both are nouns.

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

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

Other hypernyms of apology include example, instance, representative.

apology (noun)	illustration (noun)
a poor example	a visual representation (a picture or diagram) that is used to make some subject more pleasing or easier to understand
an expression of regret at having caused trouble for someone	an item of information that is typical of a class or group
a formal written defense of something you believe in strongly	artwork that helps make something clear or attractive
	showing by example