quintessence vs heart and soul

quintessence and heart and soul both are nouns.

Word	Noun	Adjective	Verb	Adverb
quintessence	Yes	No	No	No
heart and soul	Yes	No	No	Yes

As nouns, heart and soul is a hypernym of quintessence; that is, heart and soul is a word with a broader meaning than quintessence:

quintessence: the purest and most concentrated essence of something
heart and soul: the choicest or most essential or most vital part of some idea or experience

Other hypernyms of quintessence include center, centre, core, essence, gist, heart, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance, sum.

quintessence (noun)	heart and soul (noun)
the purest and most concentrated essence of something	the choicest or most essential or most vital part of some idea or experience
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 (adverb)	heart and soul (adverb)
	with complete faith