employment agency vs employment office

employment agency and employment office both are nouns.

Word	Noun	Adjective	Verb	Adverb
employment agency	Yes	No	No	No
employment office	Yes	No	No	No

As nouns, employment agency and employment office are synonyms defined as:

employment agency and employment office: an agency that finds people to fill particular jobs or finds jobs for unemployed people

employment agency (noun)	employment office (noun)
an agency that finds people to fill particular jobs or finds jobs for unemployed people	an agency that finds people to fill particular jobs or finds jobs for unemployed people