exporting country
Refers to a country that exports goods. Often used as a suffix in compounds like 石油輸出国 (oil-exporting country).
Japan is a major exporter of automobiles.
The Organization of Petroleum Exporting Countries is also called OPEC.
輸出 is the noun 'export' or the verb 'to export'. 輸出国 is the country that does the exporting.
Compound of 輸出 (export) + 国 (country).