enrichment vs improvement

enrichment and improvement both are nouns.

Word	Noun	Adjective	Verb	Adverb
enrichment	Yes	No	No	No
improvement	Yes	No	No	No

As nouns, improvement is a hypernym of enrichment; that is, improvement is a word with a broader meaning than enrichment:

enrichment (noun)	improvement (noun)
act of making fuller or more meaningful or rewarding	the act of improving something
a gift that significantly increases the recipient's wealth	a change for the better; progress in development
	a condition superior to an earlier condition