- Falkor, for one - Fierce woman on Welsh flag - Fire breathing monster - Fire-breathing monster - Formidable woman - Komodo reptile - Monster to make progress very slowly
- Folklore creature - Mythical monster - Mythical sea monster - There's a monster inside, for certain - There’s a monster inside, for certain - Tolkien beast - Tolkien’s warrior
- any wonderful solution to a difficult problem - Creature of Greek myth - Many headed monster - Multi-headed serpent slain by Hercules - Mythical water monster - Mythological snake - Nine headed water serpent