caducous vs biology

caducous is not a noun while biology is a noun.

Word	Noun	Adjective	Verb	Adverb
caducous	No	Yes	No	No
biology	Yes	No	No	No

caducous (noun)	biology (noun)
	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms

caducous (adjective)	biology (adjective)
shed at an early stage of development