accidental vs inessential

accidental and inessential both are nouns.

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

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

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