circulation vs plant life

circulation and plant life both are nouns.

Word	Noun	Adjective	Verb	Adverb
circulation	Yes	No	No	No
plant life	Yes	No	No	No

circulation (noun)	plant life (noun)
the spread or transmission of something (as news or money) to a wider group or area	(botany) a living organism lacking the power of locomotion
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