kernel vs bare bones

kernel and bare bones both are nouns.

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

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

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

kernel (noun)	bare bones (noun)
the choicest or most essential or most vital part of some idea or experience	(plural) the most basic facts or elements
a single whole grain of a cereal
the inner and usually edible part of a seed or grain or nut or fruit stone