Collocations for beast - noun

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

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

great, huge, magnificent, mighty

a beast of burden, a beast of prey

filthy
You filthy beast!

sex
Local people live in fear of this unknown sex beast.

the beast in sb
(= the violent or sexual part of sb''s character) The beast in her wanted to destroy his house.

bring out the beast in sb
Somehow she brought out the beast in him.