Pileup (noun)

A mass of things that have fallen or been piled up.

Origin:

Mid-19th century: from pile + -up.

Examples:

1. A pileup of papers covered his desk.
2. The pileup of cars caused a major traffic jam.
3. There was a pileup of logs at the bottom of the hill.
4. A pileup of snow and ice blocked the entrance to the driveway.
5. The pileup of dishes in the sink was growing larger by the day.