essence vs bare bones

essence and bare bones both are nouns.

Word	Noun	Adjective	Verb	Adverb
essence	Yes	No	No	No
bare bones	Yes	No	No	No

As nouns, bare bones is a hyponym of essence; that is, bare bones is a word with a more specific, narrower meaning than essence:

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

Other hyponyms of essence include hypostasis, haecceity, quiddity, quintessence, stuff.

essence (noun)	bare bones (noun)
a toiletry that emits and diffuses a fragrant odor	(plural) the most basic facts or elements
the choicest or most essential or most vital part of some idea or experience
the central meaning or theme of a speech or literary work
any substance possessing to a high degree the predominant properties of a plant or drug or other natural product from which it is extracted