bidirectional vs duplex

bidirectional is not a noun while duplex is a noun.

Word	Noun	Adjective	Verb	Adverb
bidirectional	No	Yes	No	No
duplex	Yes	Yes	Yes	No

bidirectional (noun)	duplex (noun)
	an apartment having rooms on two floors that are connected by a staircase
	a house with two units sharing a common wall

bidirectional (adjective)	duplex (adjective)
reactive or functioning or allowing movement in two usually opposite directions	allowing communication in opposite directions simultaneously
	(used technically of a device or process) having two parts

bidirectional (verb)	duplex (verb)
	change into a duplex