leading vs helm

leading and helm both are nouns.

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

As nouns, helm is a hyponym of leading; that is, helm is a word with a more specific, narrower meaning than leading:

Other hyponyms of leading include lead, trend setting.

leading (noun)	helm (noun)
thin strip of metal used to separate lines of type in printing	(figurative) a position of leadership
the activity of leading	steering mechanism for a vessel; a mechanical device by which a vessel is steered

leading (adjective)	helm (adjective)
going or proceeding or going in advance; showing the way
greatest in importance or degree or significance or achievement
having the leading position or higher score in a contest
indicating the most important performer or role

leading (verb)	helm (verb)
	be at or take the helm of