pithiness vs succinctness

pithiness and succinctness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pithiness	Yes	No	No	No
succinctness	Yes	No	No	No

As nouns, pithiness and succinctness are synonyms defined as:

pithiness and succinctness: terseness and economy in writing and speaking achieved by expressing a great deal in just a few words

Other synonyms of pithiness include conciseness, concision.

pithiness (noun)	succinctness (noun)
terseness and economy in writing and speaking achieved by expressing a great deal in just a few words	terseness and economy in writing and speaking achieved by expressing a great deal in just a few words