advisory board vs planning board

advisory board and planning board both are nouns.

Word	Noun	Adjective	Verb	Adverb
advisory board	Yes	No	No	No
planning board	Yes	No	No	No

As nouns, advisory board and planning board are synonyms defined as:

advisory board and planning board: a board appointed to advise the chief administrator

advisory board (noun)	planning board (noun)
a board appointed to advise the chief administrator	a board appointed to advise the chief administrator