I am a shout, a sharp sound In American football, better get ready In the military, better pay attention I am also a humble house For the indigenous, traditional For the nomad, temporary What am I?

Smooth operator in a bottle, I soothe sun's fiery kiss, and whisper comfort to parched skin, leaving a silky trace behind.

Put your hands on me just right, Twist and turn and shut me tight. You can polish me all night. If you're having trouble thinking and your hearts a flutter, it's not me it's you, your mind is in the gutter.

I circle kings but wear no crown, A silent guard that won’t back down. Not wall nor gate, yet I defend, What am I that rings the end?

Add a k and I'm a clown, remove the y, and I am a noun. I have no breath, but I bleed red, my color changes in a threesome with two other elemental variables. What happens to nails, the adjective, that can cause tetanus if you step on one, afflicted with this?