a very slight difference in meaning, sound, colour or somebody’s feelings that is not usually very obvious (Oxford)
a very slight difference in appearance, meaning, sound, etc. (Cambridge)
He watched her face intently to catch every nuance of expression. (Oxford)
You need to be able to convey the subtle nuances of meaning of each word. (Oxford)
Linguists explore the nuances of language. (Cambridge)
every nuance of expression
subtle nuances
nuances of language
Distinction
Gradation
Brightness
A lot
Nuance