What word names a small shrub and the surname of Reagan's vice president?

What small oval gland at the base of the brain is called the "master gland"? What do you call a small grand piano about 5 feet long? What is a small porch or steps leading to the entrance of a house called? What word names a small quantity you might pat on with a finger? A small slave girl named Topsy appears in which novel? What is a small sofa designed for two people called? Which athletic shoe brand is named for a small South African antelope? Which word names a small stream and sounds like the noise a squeaky stair makes?