probationary vs probation

probationary is not a noun while probation is a noun.

Word	Noun	Adjective	Verb	Adverb
probationary	No	Yes	No	No
probation	Yes	No	No	No

probationary (noun)	probation (noun)
	(law) a way of dealing with offenders without imprisoning them; a defendant found guilty of a crime is released by the court without imprisonment subject to conditions imposed by the court
	a trial period during which an offender has time to redeem himself or herself
	a trial period during which your character and abilities are tested to see whether you are suitable for work or for membership

probationary (adjective)	probation (adjective)
under terms not final or fully worked out or agreed upon