TV newsman vs television newscaster

TV newsman and television newscaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
TV newsman	Yes	No	No	No
television newscaster	Yes	No	No	No

As nouns, TV newsman and television newscaster are synonyms defined as:

TV newsman and television newscaster: someone who reports news stories via television

Other synonyms of TV newsman include television reporter, TV reporter.

TV newsman (noun)	television newscaster (noun)
someone who reports news stories via television	someone who reports news stories via television