What's the noun for octopodes? Here's the word you're looking for.
octopus
Any of several marine molluscs/mollusks, of the family Octopodidae, having no internal or external protective shell or bone (unlike the nautilus, squid or cuttlefish) and eight arms each covered with suckers.
(uncountable) The flesh of these marine molluscs eaten as food.
An organization that has many powerful branches controlled from the centre.