restoration vs improvement

restoration and improvement both are nouns.

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

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

Other hypernyms of restoration include melioration.

restoration (noun)	improvement (noun)
the act of restoring something or someone to a satisfactory state	the act of improving something
getting something back again	a change for the better; progress in development
some artifact that has been restored or reconstructed	a condition superior to an earlier condition
a model that represents the landscape of a former geological age or that represents and extinct animal etc.
the state of being restored to its former good condition