friend of the court vs advisor

friend of the court and advisor both are nouns.

Word	Noun	Adjective	Verb	Adverb
friend of the court	Yes	No	No	No
advisor	Yes	No	No	No

As nouns, advisor is a hypernym of friend of the court; that is, advisor is a word with a broader meaning than friend of the court:

friend of the court: an adviser to the court on some matter of law who is not a party to the case; usually someone who wants to influence the outcome of a lawsuit involving matters of wide public interest
advisor: an expert who gives advice

Other hypernyms of friend of the court include adviser, consultant.

friend of the court (noun)	advisor (noun)
an adviser to the court on some matter of law who is not a party to the case; usually someone who wants to influence the outcome of a lawsuit involving matters of wide public interest	an expert who gives advice