propagate vs diffuse

propagate is not an adjective while diffuse is an adjective.

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

As verbs, propagate and diffuse are synonyms defined as:

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

propagate (verb)	diffuse (verb)
multiply sexually or asexually	cause to become widely known
cause to propagate, as by grafting or layering	spread or diffuse through
cause to become widely known	move outward
transmit
transmit or cause to broaden or spread
become distributed or widespread
travel through the air
transmit from one generation to the next