specify vs specification

specify is not a noun while specification is a noun.

Word	Noun	Adjective	Verb	Adverb
specify	No	No	Yes	No
specification	Yes	No	No	No

specify (noun)	specification (noun)
	a restriction that is insisted upon as a condition for an agreement
	a detailed description of design criteria for a piece of work
	naming explicitly
	(patent law) a document drawn up by the applicant for a patent of invention that provides an explicit and detailed description of the nature and use of an invention

specify (verb)	specification (verb)
design or destine
define clearly
select something or someone for a specific purpose
be specific about
decide upon or fix definitely
specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement
determine the essential quality of