marginal vs margin

marginal is not a noun while margin is a noun.

Word	Noun	Adjective	Verb	Adverb
marginal	No	Yes	No	No
margin	Yes	No	No	No

marginal (noun)	margin (noun)
	an amount beyond the minimum necessary
	a permissible difference; allowing some freedom to move within limits
	the blank space that surrounds the text on a page
	the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities
	(finance) the net sales minus the cost of goods and services sold
	the boundary line or the area immediately inside the boundary

marginal (adjective)	margin (adjective)
of questionable or minimal quality
just barely adequate or within a lower limit
at or constituting a border or edge
producing at a rate that barely covers production costs