prosecuting officer vs public prosecutor

prosecuting officer and public prosecutor both are nouns.

Word	Noun	Adjective	Verb	Adverb
prosecuting officer	Yes	No	No	No
public prosecutor	Yes	No	No	No

As nouns, prosecuting officer and public prosecutor are synonyms defined as:

prosecuting officer and public prosecutor: a government official who conducts criminal prosecutions on behalf of the state

Other synonyms of prosecuting officer include prosecuting attorney, prosecutor.

prosecuting officer (noun)	public prosecutor (noun)
a government official who conducts criminal prosecutions on behalf of the state	a government official who conducts criminal prosecutions on behalf of the state