plant vs plant kingdom

plant and plant kingdom both are nouns.

plant (noun)	plant kingdom (noun)
buildings for carrying on industrial labor	(botany) the taxonomic kingdom comprising all living or extinct plants
(botany) a living organism lacking the power of locomotion
an actor situated in the audience whose acting is rehearsed but seems spontaneous to the audience
something planted secretly for discovery by another

plant (verb)	plant kingdom (verb)
put or set (seeds, seedlings, or plants) into the ground
fix or set securely or deeply
set up or lay the groundwork for
place into a river
place something or someone in a certain position in order to secretly observe or deceive
put firmly in the mind