tangential vs tangent

tangential is not a noun while tangent is a noun.

Word	Noun	Adjective	Verb	Adverb
tangential	No	Yes	No	No
tangent	Yes	No	No	No

tangential (noun)	tangent (noun)
	ratio of the opposite to the adjacent side of a right-angled triangle
	a straight line or plane that touches a curve or curved surface at a point but does not intersect it at that point

tangential (adjective)	tangent (adjective)
of or relating to or acting along or in the direction of a tangent
of superficial relevance if any