blue wall of silence vs blue wall

blue wall of silence and blue wall both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue wall of silence	Yes	No	No	No
blue wall	Yes	No	No	No

As nouns, blue wall of silence and blue wall are synonyms defined as:

blue wall of silence and blue wall: the secrecy of police officers who lie or look the other way to protect other police officers

Other synonyms of blue wall of silence include wall of silence.

blue wall of silence (noun)	blue wall (noun)
the secrecy of police officers who lie or look the other way to protect other police officers	the secrecy of police officers who lie or look the other way to protect other police officers