kernel vs haecceity

kernel and haecceity both are nouns.

Word	Noun	Adjective	Verb	Adverb
kernel	Yes	No	No	No
haecceity	Yes	No	No	No

As nouns, haecceity is a hyponym of kernel; that is, haecceity 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
haecceity: the essence that makes something the kind of thing it is and makes it different from any other

Other hyponyms of kernel include bare bones, hypostasis, quiddity, quintessence, stuff.

kernel (noun)	haecceity (noun)
the choicest or most essential or most vital part of some idea or experience	the essence that makes something the kind of thing it is and makes it different from any other
a single whole grain of a cereal
the inner and usually edible part of a seed or grain or nut or fruit stone