special jury vs blue ribbon jury

special jury and blue ribbon jury both are nouns.

Word	Noun	Adjective	Verb	Adverb
special jury	Yes	No	No	No
blue ribbon jury	Yes	No	No	No

As nouns, special jury and blue ribbon jury are synonyms defined as:

special jury and blue ribbon jury: a jury whose members are selected for special knowledge for a case involving complicated issues

special jury (noun)	blue ribbon jury (noun)
a jury whose members are selected for special knowledge for a case involving complicated issues	a jury whose members are selected for special knowledge for a case involving complicated issues