news vs business news

news and business news both are nouns.

Word	Noun	Adjective	Verb	Adverb
news	Yes	No	No	No
business news	Yes	No	No	No

As nouns, business news is a hyponym of news; that is, business news is a word with a more specific, narrower meaning than news:

news (noun)	business news (noun)
the quality of being sufficiently interesting to be reported in news bulletins	news about businesses and investments
information about recent and important events
information reported in a newspaper or news magazine
a program devoted to current events, often using interviews and commentary
informal information of any kind that is not previously known to someone