Wormhole

The space cadets said that at the end of the wormhole might be another universe.

The wormhole is stable.

The wormhole is unstable.

William used the flamethrower again to push the aliens into the wormhole.

The ship will reach the wormhole in a few hours.

Boris travels by wormhole.

To fill with worme-holes stately monuments.

But he had no sooner got through the worm-hole, than the lad put a small peg in the hole.

[…]where there is a net flux of lines of force, through what topologists would call "a handle" of the multiply-connected space, and what physicists might perhaps be excused for more vividly terming a "wormhole".

Wormhole distortion has overloaded main power systems!