Uk, English, England, Britain

The full name of the United Kingdom is the United Kingdom of Great Britain and Northern Ireland, but England is the largest, most populous and most economically developed part of the United Kingdom, so the United Kingdom is generally called England. Just as China has the largest area inhabited by Han Chinese, the largest population, and the most economically developed, so China's alias can be Huaxia instead of DaMeng, DaZang, for the same reason.

As for Britain, it's not a problem because Britain includes England, Scotland and Wales.

Uk is the official name of the United Kingdom

English means English, British, and refers to the language and race of people commonly spoken in the UK.

England England, which can be a substitute, alias for UK

Britain Britain, which includes England, Scotland, and Wales

Several words have different meanings.