inessential vs accidental

inessential and accidental both are nouns.

Word	Noun	Adjective	Verb	Adverb
inessential	Yes	Yes	No	No
accidental	Yes	Yes	No	No

inessential (noun)	accidental (noun)
anything that is not essential	a musical notation that makes a note sharp or flat or natural although that is not part of the key signature

inessential (adjective)	accidental (adjective)
not basic or fundamental	not of prime or central importance
not absolutely necessary	happening by chance or unexpectedly or unintentionally