quickness vs speediness

quickness and speediness both are nouns.

Word	Noun	Adjective	Verb	Adverb
quickness	Yes	No	No	No
speediness	Yes	No	No	No

As nouns, quickness and speediness are synonyms defined as:

Other synonyms of quickness include celerity, rapidity, rapidness.

quickness (noun)	speediness (noun)
a rate that is rapid	a rate that is rapid
intelligence as revealed by an ability to give correct responses without delay
skillful performance or ability without difficulty