quintessence vs quintessential

quintessence is a noun but quintessential is not a noun.

Word	Noun	Adjective	Verb	Adverb
quintessence	Yes	No	No	No
quintessential	No	Yes	No	No

quintessence (noun)	quintessential (noun)
the purest and most concentrated essence of something
the most typical example or representative of a type
the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

quintessence (adjective)	quintessential (adjective)
	representing the perfect example of a class or quality