substance vs bare bones

substance and bare bones both are nouns.

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

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

substance: 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 substance include hypostasis, haecceity, quiddity, quintessence, stuff.

substance (noun)	bare bones (noun)
the real physical matter of which a person or thing consists	(plural) the most basic facts or elements
a particular kind or species of matter with uniform properties
the property of holding together and retaining its shape
the idea that is intended
the choicest or most essential or most vital part of some idea or experience
content communicating a message; what something is about
considerable capital (wealth or income)
material of a particular kind or constitution