iceberg
//ˈaɪs.bɜːɡ//
Noun
icebergSingular
icebergsPlural
1
A large mass of ice floating in the sea, most of which is submerged beneath the water's surface.
The ship sailed carefully to avoid the iceberg.
2
Something that has a much larger hidden or unseen part than what is visible or apparent (often used in the phrase 'tip of the iceberg').
The problems we've discovered are just the tip of the iceberg.