Catholic church and Eastern orthodox

Catholic church noun - Any of several churches claiming to have maintained historical continuity with the original Christian Church.

Eastern orthodox and Catholic church are semantically related. In some cases you can replace phrase "Eastern orthodox" with "Catholic church", this phrases are similar.

Eastern orthodox noun - Derived from the Byzantine Church and adhering to Byzantine rites.

Catholic church and eastern orthodox are semantically related. You can use "Catholic church" instead a noun phrase "Eastern orthodox".