broadcast vs circularize

broadcast is a noun but circularize is not a noun.

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

As verbs, broadcast and circularize are synonyms defined as:

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

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