speed.
t for tempo
If by pace you mean 's' for steps, 't' for tread, 'm' for march,
The word pace can be interpreted in many different ways. An eight letter word meaning pace is swiftness. This is a rapid pace.
What is the first letter of a five letter word meaning "pace"?
S is for speed.
Tempo, or speed.
t for tempo
paces
t for tempo
S is for speed.
tempo
"Speed" or perhaps "haste".