nominal vs noun

nominal and noun both are nouns.

Word	Noun	Adjective	Verb	Adverb
nominal	Yes	Yes	No	No
noun	Yes	No	No	No

nominal (noun)	noun (noun)
a phrase that can function as the subject or object of a verb	a content word that can be used to refer to a person, place, thing, quality, or action
	the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition

nominal (adjective)	noun (adjective)
of, relating to, or characteristic of an amount that is not adjusted for inflation
pertaining to a noun or to a word group that functions as a noun
relating to or constituting or bearing or giving a name
existing in name only
insignificantly small; a matter of form only (`tokenish' is informal)
named; bearing the name of a specific person