publicize vs broadcast

publicize is not a noun while broadcast is a noun.

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

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

publicize (noun)	broadcast (noun)
	message that is transmitted by radio or television
	a radio or television show

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