broadcast vs circularise

broadcast is a noun but circularise is not a noun.

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

As verbs, broadcast and circularise are synonyms defined as:

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

broadcast (verb)	circularise (verb)
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