diversion vs diversionary

diversion is a noun but diversionary is not a noun.

Word	Noun	Adjective	Verb	Adverb
diversion	Yes	No	No	No
diversionary	No	Yes	No	No

diversion (noun)	diversionary (noun)
an activity that diverts or amuses or stimulates
a turning aside (of your course or attention or concern)
an attack calculated to draw enemy defense away from the point of the principal attack

diversion (adjective)	diversionary (adjective)
	(of tactics e.g.) likely or designed to confuse or deceive