import vs subtlety

import and subtlety both are nouns.

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

As nouns, subtlety is a hyponym of import; that is, subtlety is a word with a more specific, narrower meaning than import:

import (noun)	subtlety (noun)
commodities (goods or services) bought from a foreign country	the quality of being difficult to detect or analyze
having important effects or influence	a subtle difference in meaning or opinion or attitude
a meaning that is not expressly stated but can be inferred
the message that is intended or expressed or signified
an imported person brought from a foreign country

import (verb)	subtlety (verb)
indicate or signify
bring in from abroad
transfer (electronic data) into a database or document