Answer:
It is worldwide, but once only a spider could weave one
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
Used left or right, I get to travel over cobblestone or gravel. Used up, I vie for sweet success, used down, I cause men great duress.
What word in the English language uses all five vowels plus Y in alphabetical order, and uses each only once?
I can travel from there to here by disappearing, and here to there by reappearing.
My days are numbered.