ex-post evaluation vs rating

ex-post evaluation and rating both are nouns.

Word	Noun	Adjective	Verb	Adverb
ex-post evaluation	Yes	No	No	No
rating	Yes	No	No	No

As nouns, rating is a hypernym of ex-post evaluation; that is, rating is a word with a broader meaning than ex-post evaluation:

ex-post evaluation: a type of summative evaluation of an initiative after it has been completed.
rating: an appraisal of the value of something

Other hypernyms of ex-post evaluation include evaluation, valuation.

ex-post evaluation (noun)	rating (noun)
a type of summative evaluation of an initiative after it has been completed.	act of ascertaining or fixing the value or worth of
	an appraisal of the value of something
	standing or position on a scale
	rank in a military organization