postpone vs probate

postpone is not a noun while probate is a noun.

Word	Noun	Adjective	Verb	Adverb
postpone	No	No	Yes	No
probate	Yes	No	Yes	No

As verbs, probate is a hyponym of postpone; that is, probate is a word with a more specific, narrower meaning than postpone:

Other hyponyms of postpone include call, hold, suspend, reprieve, respite.

postpone (noun)	probate (noun)
	the act of proving that an instrument purporting to be a will was signed and executed in accord with legal requirements
	a judicial certificate saying that a will is genuine and conferring on the executors the power to administer the estate

postpone (verb)	probate (verb)
hold back to a later time	establish the legal validity of (wills and other documents)
	put a convicted person on probation by suspending his sentence