circulate vs circulation

circulate is not a noun while circulation is a noun.

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

circulate (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

circulate (verb)	circulation (verb)
cause to become widely known
become widely known and passed on
move around freely from person to person or from place to place
move through a space, circuit or system, returning to the starting point
cause to be distributed
cause to move in a circuit or system