circularise vs diffuse

circularise is not an adjective while diffuse is an adjective.

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

As verbs, circularise and diffuse are synonyms defined as:

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

circularise (verb)	diffuse (verb)
cause to become widely known	cause to become widely known
distribute circulars to	spread or diffuse through
canvass by distributing letters	move outward