staff office vs personnel department

staff office and personnel department both are nouns.

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

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

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

Other synonyms of staff office include personnel, personnel office.

staff office (noun)	personnel department (noun)
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