concision vs conciseness

concision and conciseness both are nouns.

Word	Noun	Adjective	Verb	Adverb
concision	Yes	No	No	No
conciseness	Yes	No	No	No

As nouns, concision and conciseness are synonyms defined as:

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

Other synonyms of concision include pithiness, succinctness.

concision (noun)	conciseness (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