broadcast vs newscast

broadcast and newscast both are nouns.

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

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

Other hyponyms of broadcast include rebroadcast, radio broadcast, simulcast, telecast.

broadcast (noun)	newscast (noun)
message that is transmitted by radio or television	a broadcast of news or commentary on the news
a radio or television show

broadcast (verb)	newscast (verb)
cause to become widely known
broadcast over the airwaves, as in radio or television
sow over a wide area, especially by hand