object lesson vs example

object lesson and example both are nouns.

Word	Noun	Adjective	Verb	Adverb
object lesson	Yes	No	No	No
example	Yes	No	No	No

As nouns, object lesson and example are synonyms defined as:

Other synonyms of object lesson include deterrent example, lesson.

object lesson (noun)	example (noun)
punishment intended as a warning to others	a task performed or problem solved in order to develop skill or understanding
	an item of information that is typical of a class or group
	something to be imitated
	a representative form or pattern
	punishment intended as a warning to others
	an occurrence of something