margin vs marginal

margin is a noun but marginal is not a noun.

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

margin (noun)	marginal (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

margin (adjective)	marginal (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