Greek Church and Orthodox Church

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

Orthodox Church and Greek Church are semantically related. In some cases you can use "Orthodox Church" instead a noun phrase "Greek Church".

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

Greek Church and Orthodox Church are semantically related. Sometimes you can replace phrase "Greek Church" with "Orthodox Church", this phrases are similar.