directional vs leading

directional is not a noun while leading is a noun.

Word	Noun	Adjective	Verb	Adverb
directional	No	Yes	No	No
leading	Yes	Yes	No	No

directional (noun)	leading (noun)
	thin strip of metal used to separate lines of type in printing
	the activity of leading

directional (adjective)	leading (adjective)
relating to or indicating directions in space	going or proceeding or going in advance; showing the way
relating to direction toward a (nonspatial) goal	greatest in importance or degree or significance or achievement
showing the way by conducting or leading; imposing direction on	having the leading position or higher score in a contest
	indicating the most important performer or role