minimum vs marginal

minimum is a noun but marginal is not a noun.

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

minimum (noun)	marginal (noun)
the point on a curve where the tangent changes from negative on the left to positive on the right
the smallest possible quantity

minimum (adjective)	marginal (adjective)
the least possible	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