I learn almost every word on my own, in my productive if a bit peculiar way. I inevitably get perplexed by the ambiguity and the interchangeabilty between the words that I discover with more details.
I'd like to make my question into two parts with a view to solving it with efficiency. Let work on the quantifiers first, I have come up with the following examples.
Set number one—shade, touch, suspicion, snatch, scrap, shadow.(they roughly mean a little amount of something both concrete or abstract). The words are ordered by my consideration of their compatibility in the sentences. However, it would be even greater if you have some others in striking harmony with these sentences.
The tune conveys a shade/touch/suspicion (I preclude the possibility of the rest) of melancholy.
Her smile cannot mask a shade/shadow/touch of fear that actually keeps her trembling.
The executive struck me off without a touch/suspicion/sense (I suppose it would fit) of commiseration.
We just need a snatch/touch/scrap of sugar and we can start making a bundt cake.
Set number two—ephemeral, fleeting, instantaneous, evanescent. (From what I have learned, they are sometimes used to describe something that appears and disappears, and the whole process happens within a very short term of time).
At twilight, the flash of real beauty is evanescent/instantaneous/ephemeral.
These golden days that I spent with you were ephemeral/fleeting: they could never be retrieved.