Eastern Orthodox Church and Greek Church

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

Greek Church and Eastern Orthodox Church are semantically related. In some cases you can replace phrase "Greek Church" with "Eastern Orthodox Church", this phrases are similar.

Greek Church noun - State church of Greece; an autonomous part of the Eastern Orthodox Church.

Eastern Orthodox Church and Greek Church are semantically related. You can use "Eastern Orthodox Church" instead a noun phrase "Greek Church".