personnel vs personnel office

personnel and personnel office both are nouns.

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

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

personnel and personnel 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, staff office.

personnel (noun)	personnel 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