circulation vs circulate

circulation is a noun but circulate is not a noun.

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

circulation (noun)	circulate (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

circulation (verb)	circulate (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