punctuality vs promptness

punctuality and promptness both are nouns.

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

As nouns, punctuality and promptness are synonyms defined as:

punctuality and promptness: the quality or habit of adhering to an appointed time

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