Here are some other options, depending on the context:
* "Anghenfil" (pronounced "an-gen-vil") - This literally means "evil beast" and is used for particularly monstrous or terrifying creatures.
* "Crwban" (pronounced "kroo-ban") - This is a more general term for a "monster" or "creature," but it can also refer to a "goblin" or "ogre."
* "Ddraig" (pronounced "draig") - While often translated as "dragon," "Ddraig" can also be used for other large, fearsome creatures, essentially functioning as another word for "monster."
The best translation will depend on the specific context and the type of monster you're referring to.