Cape buffalo and Old World buffalo

Cape buffalo noun - Large often savage buffalo of southern Africa having upward-curving horns; mostly in game reserves.

Old World buffalo and Cape buffalo are semantically related. In some cases you can use "Old World buffalo" instead a noun phrase "Cape buffalo".

Old World buffalo noun - Any of several Old World animals resembling oxen including, e.g., water buffalo; Cape buffalo.

Cape buffalo and Old World buffalo are semantically related. Sometimes you can replace phrase "Cape buffalo" with "Old World buffalo", this phrases are similar.