Base runner and Baseball player

Base runner noun - A baseball player on the team at bat who is on base (or attempting to reach a base).

Baseball player and base runner are semantically related. In some cases you can use "Baseball player" instead a noun phrase "Base runner".

Baseball player noun - An athlete who plays baseball.

Base runner and baseball player are semantically related. Sometimes you can replace phrase "Base runner" with "Baseball player", this phrases are similar.