newscaster

As nouns the difference between broadcast and newscaster

is that broadcast is a transmission of a radio or television programme aired to be received by anyone with a receiver while newscaster is one who delivers the news for broadcast on television, radio, etc; a newsreader.

As an adjective broadcast

is (omnidirectionally)cast or scattered widely, in all directions.

As a verb broadcast

is to transmit a message or signal via radio waves or electronic means.