Promptitude is a related term of expertness.
As nouns the difference between promptitude and expertness
is that promptitude is the quality of being prompt; alacrity while expertness is the state of being expert; skill or proficiency.
promptitude
English
Noun
(-)
The quality of being prompt; alacrity.
Synonyms
* (quality of being prompt) promptness
expertness
English
Noun
(-)
The state of being expert; skill or proficiency