Developing countries and Developing country

Developing country and developing countries are semantically related In some cases you can replace phrase "Developing country" with "Developing countries", this phrases are similar.

Developing country noun - A country that is poor and whose citizens are mostly agricultural workers but that wants to become more advanced socially and economically.

Developing countries and developing country are semantically related in underdeveloped countries topic. You can use "Developing countries" instead a noun phrase "Developing country".