Minotaur.
The Minotaur, who was the son of a white bull, and the queen of the city of Crete. It lived in a labyrinth in the city and fed on sacrifices of seven boys and seven girls.
Cerberus is the name given to the entity which, in Greek and Roman mythology, is a multi-headed dog which guards the gates of Hades, to prevent those who have crossed the river Styx from ever escaping.
Scylla.
Poseidon was the Olympian god of the sea. There are numerous other, minor water gods such as Asopus (Ασωπός).
Literally, "bull-headed", or stubborn...
Cerebus/Cerberus
The monster with a hundred hands, in Greek mythology, was called Hechtonchires.
Charybdis
Cerberus was the three headed dog that guarded the entrance to the underworld.
Scylla
Five-Headed Dragon.
Cetus received its named from a sea monster in Greek mythology.