accidental vs accident

accidental and accident both are nouns.

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

accidental (noun)	accident (noun)
a musical notation that makes a note sharp or flat or natural although that is not part of the key signature	anything that happens suddenly or by chance without an apparent cause
	an unfortunate mishap; especially one causing damage or injury

accidental (adjective)	accident (adjective)
not of prime or central importance
happening by chance or unexpectedly or unintentionally