body and soul vs heart and soul

body and soul is not a noun while heart and soul is a noun.

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

As adverbs, body and soul and heart and soul are synonyms defined as:

body and soul (noun)	heart and soul (noun)
	the choicest or most essential or most vital part of some idea or experience

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