advertising
advertising agency

agency
by the agency of

AID
Agency for International Development

aid
aid agency

CIA
Central Intelligence Agency

CSA
Child Support Agency

DARPA
...Projects Agency agency

dating
dating agency

ECHA
European Chemicals Agency 

employment
employment office / employment agency

ESA
European Space Agency

escort
escort agency

estate
estate agency

IAEA
International Atomic Energy Agency

IARC
...on Cancer agency

IEA
International Energy Agency

news
news agency

NSA
National Security Agency

press
press agency

scholastic
scholastic agency

space
space agency

tourist
tourist agency

travel
travel agency

UNRWA
United Nations Relief and Works Agency