Department of Trade; Ministry of Trade
Refers to a government body responsible for trade policy. The exact translation depends on the country's naming conventions (e.g., 'Department' in the US, 'Ministry' in Japan or the UK).
Japan's Ministry of Trade is the Ministry of Economy, Trade and Industry.
The US Department of Trade is part of the Department of Commerce.
Often used for the US Department of Commerce, which includes trade functions. 貿易省 is more directly 'trade' focused.
Compound of 貿易 (trade) and 省 (ministry/department). A straightforward Sino-Japanese term for a government trade body.