Cruise liner and Ocean liner

Cruise liner noun - A passenger ship used commercially for pleasure cruises.

Ocean liner and cruise liner are semantically related. In some cases you can use "Ocean liner" instead a noun phrase "Cruise liner".

Ocean liner noun - A large commercial ship (especially one that carries passengers on a regular schedule).

Cruise liner and ocean liner are semantically related. Sometimes you can replace phrase "Cruise liner" with "Ocean liner", this phrases are similar.