Synonyms for monster

noun

1. A great beast

   beast, beastlike creature, basilisk, imaginary monster, centaur, monstrosity, Gorgon, sphinx, Minotaur, Hydra, kraken, Python, salamander, chimera, lamia, unicorn, echidna, dragon, griffin, cyclops, cockatrice, hippocampus, phoenix, mermaid, hippogriff, gyascutus, androsphinx, dipsas, sagittary, sea serpent, hippocentaur, manticore, hippocert, whangdoodle, roe, bucentaur, rhinoceros, elephant, lycanthrope, werewolf, uturuncu.

2. An unnatural creation

   abnormality, abnormity, monstrosity; see freak 2.