broadcast vs popularise

broadcast is a noun but popularise is not a noun.

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

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

broadcast: cause to become widely known
popularise: cater to popular taste to make popular and present to the general public; bring into general or common use

Other hyponyms of broadcast include podcast, sow, generalise, generalize, popularize, vulgarise, vulgarize, carry, run.

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

broadcast (verb)	popularise (verb)
cause to become widely known	make understandable to the general public
broadcast over the airwaves, as in radio or television	cater to popular taste to make popular and present to the general public; bring into general or common use
sow over a wide area, especially by hand