broadcast vs propagate

broadcast is a noun but propagate is not a noun.

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

As verbs, broadcast and propagate are synonyms defined as:

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

broadcast (verb)	propagate (verb)
cause to become widely known	multiply sexually or asexually
broadcast over the airwaves, as in radio or television	cause to propagate, as by grafting or layering
sow over a wide area, especially by hand	cause to become widely known
	transmit
	transmit or cause to broaden or spread
	become distributed or widespread
	travel through the air
	transmit from one generation to the next