subtlety vs refinement

subtlety and refinement both are nouns.

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

As nouns, subtlety and refinement are synonyms defined as:

subtlety and refinement: a subtle difference in meaning or opinion or attitude

Other synonyms of subtlety include nicety, nuance, shade.

subtlety (noun)	refinement (noun)
the quality of being difficult to detect or analyze	the quality of excellence in thought and manners and taste
a subtle difference in meaning or opinion or attitude	a subtle difference in meaning or opinion or attitude
	the result of improving something
	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