diffuse vs circularize

diffuse is an adjective but circularize is not an adjective.

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

As verbs, diffuse and circularize are synonyms defined as:

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

diffuse (verb)	circularize (verb)
cause to become widely known	make circular
spread or diffuse through	cause to become widely known
move outward	distribute circulars to
	canvass by distributing letters
	canvass by using a questionnaire