noun
iceberg
Refers to a large floating mass of ice detached from a glacier. Often used metaphorically as in 'tip of the iceberg' (氷山の一角).
船は氷山に衝突して沈没した。
The ship collided with an iceberg and sank.
これは問題の氷山の一角に過ぎない。
This is just the tip of the iceberg of the problem.