personnel vs staff office

personnel and staff office both are nouns.

Word	Noun	Adjective	Verb	Adverb
personnel	Yes	No	No	No
staff office	Yes	No	No	No

As nouns, personnel and staff office are synonyms defined as:

personnel and staff office: the department responsible for hiring and training and placing employees and for setting policies for personnel management

Other synonyms of personnel include personnel department, personnel office.

personnel (noun)	staff office (noun)
group of people willing to obey orders	the department responsible for hiring and training and placing employees and for setting policies for personnel management
the department responsible for hiring and training and placing employees and for setting policies for personnel management