bare bones vs heart and soul

bare bones and heart and soul both are nouns.

Word	Noun	Adjective	Verb	Adverb
bare bones	Yes	No	No	No
heart and soul	Yes	No	No	Yes

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

bare bones: (plural) the most basic facts or elements
heart and soul: the choicest or most essential or most vital part of some idea or experience

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

bare bones (noun)	heart and soul (noun)
(plural) the most basic facts or elements	the choicest or most essential or most vital part of some idea or experience

bare bones (adverb)	heart and soul (adverb)
	with complete faith