Do you ever write a word and then ralise you're not quite sure of the meaning and whether it's appropriate; so you look it up and find it's perfect, and you needn't have worried? I do that all the time. Yesterday it was the word 'bijou', which turned out to mean 'small and elegant', absolutely right for the expensive little shops I was trying to describe.
I must have this store of words in my subconscious that I've forgotten, but they pop up when they're needed. Isn't the human brain an amazingly wonderful thing?