Meaning: People who catch fish use a boat to seize and hold aquatic creatures.
Choice of Words: Fishermen: people who catch fish; catch: seize and hold; fish: aquatic creature; boat: vessel for travel on water.
Alternative Expressions
The fishermen caught a big fish.
Meaning: This sentence tells us that the fishermen were successful in catching a large fish.
Choice of Words: Fishermen are people who catch fish. "Caught" means that they were able to grab or capture the fish. "Big" means that the fish was large in size.
The fishermen are fishing in the ocean.
Meaning: This sentence tells us that the fishermen are currently trying to catch fish in the ocean.
Choice of Words: Fishermen are people who catch fish. "Fishing" means that they are actively trying to catch fish. "Ocean" is the name for the large body of salt water that covers most of the Earth.