Answer:
What English word retains the same pronunciation, even after you take away four of its five letters?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
Vikings use this for warmth.
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
I am a span of time you can always see through I am also the timepiece with the most pieces. What am I?
You use it between your head and your toes, the more it works the thinner it grows.