newscast vs news

newscast and news both are nouns.

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

As nouns, news is a hypernym of newscast; that is, news is a word with a broader meaning than newscast:

Other hypernyms of newscast include broadcast.

newscast (noun)	news (noun)
a broadcast of news or commentary on the news	the quality of being sufficiently interesting to be reported in news bulletins
	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