perfection vs improvement

perfection and improvement both are nouns.

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

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

perfection (noun)	improvement (noun)
the act of making something perfect	the act of improving something
an ideal instance; a perfect embodiment of a concept	a change for the better; progress in development
the state of being without a flaw or defect	a condition superior to an earlier condition