betterment vs improvement

betterment and improvement both are nouns.

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

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

As nouns, betterment and improvement are synonyms defined as:

betterment and improvement: a change for the better; progress in development

Other synonyms of betterment include advance.

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

Other hypernyms of betterment include melioration.

betterment (noun)	improvement (noun)
the act of relieving ills and changing for the better	the act of improving something
a change for the better; progress in development	a change for the better; progress in development
an improvement that adds to the value of a property or facility	a condition superior to an earlier condition