broadcast vs diffuse

broadcast is a noun but diffuse is not a noun.

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

As verbs, broadcast and diffuse are synonyms defined as:

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

broadcast (adjective)	diffuse (adjective)
	(of light) transmitted from a broad light source or reflected
	spread out; not concentrated in one place
	lacking conciseness

broadcast (verb)	diffuse (verb)
cause to become widely known	cause to become widely known
broadcast over the airwaves, as in radio or television	spread or diffuse through
sow over a wide area, especially by hand	move outward