pacing vs tempo

pacing and tempo both are nouns.

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

As nouns, pacing and tempo are synonyms defined as:

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

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