circulatory vs circulation

circulatory is not a noun while circulation is a noun.

Word	Noun	Adjective	Verb	Adverb
circulatory	No	Yes	No	No
circulation	Yes	No	No	No

circulatory (noun)	circulation (noun)
	the spread or transmission of something (as news or money) to a wider group or area
	the dissemination of copies of periodicals (as newspapers or magazines)
	free movement or passage (as of cytoplasm within a cell or sap through a plant)
	movement through a circuit; especially the movement of blood through the heart and blood vessels
	number of copies of a newspaper or magazine that are sold
	(library science) the count of books that are loaned by a library over a specified period

circulatory (adjective)	circulation (adjective)
relating to circulatory system or to circulation of the blood
of or relating to circulation