incidental vs basic

incidental and basic both are nouns.

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

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

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