minister vs government minister

minister and government minister both are nouns.

Word	Noun	Adjective	Verb	Adverb
minister	Yes	No	Yes	No
government minister	Yes	No	No	No

As nouns, minister and government minister are synonyms defined as:

minister and government minister: a person appointed to a high office in the government

minister (noun)	government minister (noun)
the job of a head of a government department	a person appointed to a high office in the government
a person authorized to conduct religious worship
a diplomat representing one government to another; ranks below ambassador
a person appointed to a high office in the government

minister (verb)	government minister (verb)
work as a minister
attend to the wants and needs of others