jejune vs poor

jejune is not a noun while poor is a noun.

Word	Noun	Adjective	Verb	Adverb
jejune	No	Yes	No	No
poor	Yes	Yes	No	No

As adjectives, jejune and poor are synonyms defined as:

Other synonyms of jejune include inadequate, short.

jejune (noun)	poor (noun)
	people without possessions or wealth (considered as a group)

jejune (adjective)	poor (adjective)
displaying or suggesting a lack of maturity	having little money or few possessions
of insufficient quantity to meet a need	lacking in quality or substances
lacking interest or significance or impact	characterized by or indicating poverty
	of insufficient quantity to meet a need
	deserving or inciting pity