friend of the court vs adviser

friend of the court and adviser both are nouns.

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

As nouns, adviser is a hypernym of friend of the court; that is, adviser 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
adviser: an expert who gives advice

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

friend of the court (noun)	adviser (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