Rapid

23 clues
Fire
Brisk
Fleet
Swift
Wingy
Hasty
Speedy
Quick!
Express
REM part
--- fast!
BART part
Galloping
Very fast
Very quick
Precipitate
Part of REM
Expeditious
Part of BART
Presto ____!
Fleet of foot
Flying through
Type of transit
Similar answers:
A?ra
Aaarated
Aaarating
Aarau
Aaronburrconspiracy
Aattheopera
Aattheraces
Aaverage
Aaverages
Abdera
Abelleforadano
Aberrance
Aberrancy
Aberrant
Aberrantly
Aberrate
Aberration
Aberrations
Abetskramer
Abettermusetrap