circularize vs broadcast

circularize is not a noun while broadcast is a noun.

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

As verbs, circularize and broadcast are synonyms defined as:

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

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

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