public prosecutor vs prosecuting officer

public prosecutor and prosecuting officer both are nouns.

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

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

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

Other synonyms of public prosecutor include prosecuting attorney, prosecutor.

public prosecutor (noun)	prosecuting officer (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