Hercules killed the hydra, not odysseus
Odysseus defeated the Cyclops, who was Poseidon's son Odysseus defeated Poseidon's son the Cyclops
Odysseus is presumably killed by old age.
Antinous is the leading suitor killed by Odysseus.
Hydra
All of Odysseus' men are eventually killed before he gets to Ithaca.
The Lernean Hydra is killed by Heracles in his second of twelve labors. However why the Hydra is killed is never fully explained.
Odysseus defeated the Cyclops, who was Poseidon's son Odysseus defeated Poseidon's son the Cyclops
Hydra or Hydra
Hercules/Heracles killed the Nemean Lion and the Hydra.
Odysseus is presumably killed by old age.
The Roman Name for The Hydra is just Hydra.
Antinous is the leading suitor killed by Odysseus.
He killed the Hydra
hydra
gorgon is another name for hydra
Lernaean Hydra.
In the end it was the Hydra that killed Hercules