basic vs incidental

basic and incidental both are nouns.

Word	Noun	Adjective	Verb	Adverb
basic	Yes	Yes	No	No
incidental	Yes	Yes	No	No

basic (noun)	incidental (noun)
(usually in the plural) a necessary commodity for which demand is constant	an item that is incidental
	(frequently plural) an expense not budgeted or not specified

basic (adjective)	incidental (adjective)
pertaining to or constituting a base or basis	(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
of or denoting or of the nature of or containing a base	not of prime or central importance
reduced to the simplest and most significant form possible without loss of generality	occurring with or following as a consequence
serving as a base or starting point