circularise vs broadcast

circularise is not a noun while broadcast is a noun.

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

As verbs, circularise and broadcast are synonyms defined as:

Other synonyms of circularise include circularize, circulate, diffuse, disperse, disseminate, distribute, pass around, propagate, spread.

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

circularise (verb)	broadcast (verb)
cause to become widely known	cause to become widely known
distribute circulars to	broadcast over the airwaves, as in radio or television
canvass by distributing letters	sow over a wide area, especially by hand