haecceity vs heart and soul

haecceity and heart and soul both are nouns.

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

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

haecceity: the essence that makes something the kind of thing it is and makes it different from any other
heart and soul: the choicest or most essential or most vital part of some idea or experience

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

haecceity (noun)	heart and soul (noun)
the essence that makes something the kind of thing it is and makes it different from any other	the choicest or most essential or most vital part of some idea or experience

haecceity (adverb)	heart and soul (adverb)
	with complete faith