Iron curtain and Iron curtains

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.

Iron curtains and iron curtain are semantically related In some cases you can replace phrase "Iron curtains" with "Iron curtain", this phrases are similar.

Iron curtain and iron curtains are semantically related in speech topic. Sometimes you can use "Iron curtain" instead a noun phrase "Iron curtains", if it concerns topics such as silence, forbiddance.