nicety vs subtlety

nicety and subtlety both are nouns.

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

As nouns, nicety and subtlety are synonyms defined as:

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

Other synonyms of nicety include nuance, refinement, shade.

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