A noise bees do, A character from Toy Story, A homophone for a public transport

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire word signifies a great woman. What is the word?

A whisper of steel, through a loaf it will glide, Dividing the whole, revealing the inside. A wedge of a pie or a cake, you'll see, A portioned piece, just perfect for tea.

On doors I turn, on radios too, a simple twist is all you do. I open rooms or change a tone what am I you turn on your own?

An insult for the one who gives up first. A head to head game for the stubborn. Come on you coward let's do our worst.