stipulate vs stipulation

stipulate is not a noun while stipulation is a noun.

Word	Noun	Adjective	Verb	Adverb
stipulate	No	No	Yes	No
stipulation	Yes	No	No	No

stipulate (noun)	stipulation (noun)
	a restriction that is insisted upon as a condition for an agreement
	an assumption on which rests the validity or effect of something else
	(law) an agreement or concession made by parties in a judicial proceeding (or by their attorneys) relating to the business before the court; must be in writing unless they are part of the court record

stipulate (verb)	stipulation (verb)
specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
give a guarantee or promise of
make an oral contract or agreement in the verbal form of question and answer that is necessary to give it legal force