plant is a noun but carnivorous is not a noun.

plant is not an adjective while carnivorous is an adjective.

plant is a verb but carnivorous is not a verb.

plant (noun)	carnivorous (noun)
buildings for carrying on industrial labor
(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 (adjective)	carnivorous (adjective)
	relating to or characteristic of carnivores
	(used of plants as well as animals) feeding on animals

plant (verb)	carnivorous (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