Answer:
What types of words are these: madam, civic, eye, level?
My first is a body of water. My second is me. My third came before. My fourth before all three. My fifth sounds like my first. My sixth is in a lake. Put all six together to make an animal that will keep you awake.
What instrument can make any sound and be heart, but not touched or seen?
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
What is that which, though black itself, enlightens the world without burning?
What never gets any wetter no matter how hard it rains?