haecceity vs pith

haecceity and pith both are nouns.

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

As nouns, pith is a hypernym of haecceity; that is, pith is a word with a broader meaning than haecceity:

haecceity: the essence that makes something the kind of thing it is and makes it different from any other
pith: the choicest or most essential or most vital part of some idea or experience

haecceity (noun)	pith (noun)
the essence that makes something the kind of thing it is and makes it different from any other	the choicest or most essential or most vital part of some idea or experience
	soft spongelike central cylinder of the stems of most flowering plants

haecceity (verb)	pith (verb)
	remove the pith from (a plant)