Nobody answered me, so I researched it up. You can still answer to help other people, though!

Spring Storm

The sky has given over
its bitterness.
Out of the dark change
all day long
rain falls and falls
as if it would never end.
Still the snow keeps
its hold on the ground.
But water, water
from a thousand runnels!
It collects swiftly,
dappled with black
cuts a way for itself
through green ice in the gutters.
Drop after drop it falls
from the withered grass-stems
of the overhanging embankment.

- by William Carlos Williams

Why does Williams repeat words within the same line?

Question in my paper assignment