subtlety vs nicety

subtlety and nicety both are nouns.

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

As nouns, subtlety and nicety are synonyms defined as:

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

Other synonyms of subtlety include nuance, refinement, shade.

subtlety (noun)	nicety (noun)
the quality of being difficult to detect or analyze	conformity with some esthetic standard of correctness or propriety
a subtle difference in meaning or opinion or attitude	a subtle difference in meaning or opinion or attitude