Answer:
Against the sun I protect your eyes and am often worn on the face of spies
What always ends everything?
What word is pronounced the same if you take away four of its five letters?
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.