Iron curtain and Obstacle

Iron curtain noun - An impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries.

Obstacle and iron curtain are semantically related. In some cases you can use "Obstacle" instead a noun phrase "Iron curtain".

Obstacle noun - Something that makes movement or progress difficult.

Iron curtain and obstacle are semantically related. Sometimes you can replace phrase "Iron curtain" with "Obstacle", this terms are similar.