caducous vs shed

caducous is not a noun while shed is a noun.

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

As adjectives, caducous and shed are synonyms defined as:

caducous (noun)	shed (noun)
	an outbuilding with a single story; used for shelter or storage

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

caducous (verb)	shed (verb)
	cast off hair, skin, horn, or feathers
	cause or allow (a solid substance) to flow or run out or over
	to remove
	pour out in drops or small quantities or as if in drops or small quantities