Answer:
What has a mouth but can't chew?
What can you throw but not catch?
What kinds of men are always above board?
Describes universities like Harvard and can be poisonous.
A hole in a pole, though I fill a hole in white. I'm used more by the day, and less by the night.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?