First, refer to different
1，dock: dock。
2. Pier: Pier.
3. Wharf: Shantou.
4. Pier: Pier.
Second, the usage is different.
1.Dock: When used as a noun, it means "dock"; when converted into a verb, it means "(make) dock", which means that the ship stops at the dock: the dock loads and unloads goods or repairs the ship.
Pierre: It can also mean "cut off the tail", which can be extended to "deduct from the salary"
Quay: It can be used as both a transitive verb and an intransitive verb. When it is used as a transitive verb, it can be used in the passive structure with nouns or pronouns as objects.
4. Wharf: A wharf usually built parallel to the coastline.
Third, the emphasis is different.
1, dock: refers to dock.
2. Wharf: convex wharf.
3.quay: commonly used in technical terms.
4. Dock: the unloading dock designated by the customs.