Collocations for beast - noun

ferocious, ravenous, savage, snarling, wild
Savage beasts once roamed these forests.

fearsome, foul (literary), hideous, monstrous
The princess came face-to-face with a hideous beast.

exotic, fantastic, legendary, mythical, rare, strange
paintings of mythical beasts

prehistoric
the fossilized skeletons of prehistoric beasts

great, huge, magnificent, mighty
winged
Legend had it he flew through the air on a winged beast.

a beast of burden, a beast of prey