tempo vs pacing

tempo and pacing both are nouns.

Word	Noun	Adjective	Verb	Adverb
tempo	Yes	No	No	No
pacing	Yes	No	No	No

As nouns, tempo and pacing are synonyms defined as:

tempo and pacing: (music) the speed at which a composition is to be played

tempo (noun)	pacing (noun)
the rate of some repeating event	walking with slow regular strides
(music) the speed at which a composition is to be played	(music) the speed at which a composition is to be played