testament vs testamentary

testament is a noun but testamentary is not a noun.

Word	Noun	Adjective	Verb	Adverb
testament	Yes	No	No	No
testamentary	No	Yes	No	No

testament (noun)	testamentary (noun)
a profession of belief
a legal document declaring a person's wishes regarding the disposal of their property when they die
strong evidence for something

testament (adjective)	testamentary (adjective)
	of or relating to a will or testament or bequeathed by a will or testament