Cover-up and Wall of silence

Cover-up noun - Something that covers or conceals like a piece of cloth.

Wall of silence and cover-up are semantically related. In some cases you can replace phrase "Wall of silence" with "Cover-up", this phrases are similar.

Wall of silence noun - The secrecy of police officers who lie or look the other way to protect other police officers.

Cover-up and wall of silence are semantically related. You can use "Cover-up" instead a noun phrase "Wall of silence".