promptitude vs promptness

promptitude and promptness both are nouns.

Word	Noun	Adjective	Verb	Adverb
promptitude	Yes	No	No	No
promptness	Yes	No	No	No

As nouns, promptitude and promptness are synonyms defined as:

promptitude and promptness: the characteristic of doing things without delay

promptitude (noun)	promptness (noun)
the characteristic of doing things without delay	the characteristic of doing things without delay
	the quality or habit of adhering to an appointed time