A strong vocabulary allows you to select the precise word for what your trying to say.Whether you're a writer on Grub Street, or talking to your gormless friend, you should have a strong vocabulary suited to your situation.
It has been commented that it is all very well knowing these words but one mustn't show off vocabulary for the sake of it. Remember if you want to use these words make sure you are using them correctly and because they are the right word for the job. Let's start:
gloaming
noun
Meaning: twilight / dusk
Sentence: In the gloaming it was hard to tell if it was a sleeping dragon or just a statue.
Origin: Old English. Glōmung is the Old English, from the stem Glōm meaning twilight.