Octopuses are not transparent, and are usually larger, and shaped totally different from jellyfish. They have eight arms, while jellyfish have tentacles, string-like in shape.
Octopus
Yes a lion mane jellyfish can kill octopus. Because the octopus can not take the rage and power that the jellyfish is providing.
jellyfish sting
It depends on what type of jellyfish!
no
A blue ringed octopus.
a jellyfish and a octopus have no backbones
Tentacles
Jellyfish, octopus, sea urchin
squid, octopus, and you.
TENTACLES - elongated physical features, as on an octopus or jellyfish
No. Octopus are high end predators. They enjoy arthrodpods -- crabs and the like. They're quite carnivorous and can occassionally catch small live fish. Jellyfish are almost never eaten at all. The exception is the pelagic Sunfish, which seems to be immune to a jellyfish's stinging cells.