refinement vs betterment

refinement and betterment both are nouns.

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

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

Other hypernyms of refinement include advance, improvement.

refinement (noun)	betterment (noun)
the quality of excellence in thought and manners and taste	the act of relieving ills and changing for the better
a subtle difference in meaning or opinion or attitude	a change for the better; progress in development
the result of improving something	an improvement that adds to the value of a property or facility
the process of removing impurities (as from oil or metals or sugar etc.)
a highly developed state of perfection; having a flawless or impeccable quality