hindsight vs understanding

hindsight and understanding both are nouns.

Word	Noun	Adjective	Verb	Adverb
hindsight	Yes	No	No	No
understanding	Yes	Yes	No	No

As nouns, understanding is a hypernym of hindsight; that is, understanding is a word with a broader meaning than hindsight:

Other hypernyms of hindsight include apprehension, discernment, savvy.

hindsight (noun)	understanding (noun)
understanding the nature of an event after it has happened	the capacity for rational thought or inference or discrimination
	the cognitive condition of someone who understands
	an inclination to support or be loyal to or to agree with an opinion
	the statement (oral or written) of an exchange of promises

hindsight (adjective)	understanding (adjective)
	characterized by understanding based on comprehension and discernment and empathy