No sooner spoken than broken. What is it?

My first four, the opposite of a whisper. My last two, if you get hurt, you might utter. Put me together for a coldplay song.

Having plenty can make you feel grand, But pulling it in public is seldom well-planned. It bends sometimes, yet stands erect, Always capped with a head, you'd expect. It gives you nerve, keeps you steady and fine- Name it carefully: what is mine?

I have no voice, yet I’m full of names. I never move, yet traffic flows on me. I can be long or short, rich or poor, Homes face me, footsteps mark me, and cities are built upon me. What am I?

In the bathroom, I'm a helpful tool, with a funny name that rhymes with bunger. What am I