As nouns the difference between mollusk and octopod
is that mollusk is (us) while octopod is any animal with eight feet or foot-like parts.
octopod
English
Noun
(
en noun)
Any animal with eight feet or foot-like parts.
Any cephalopod mollusks of the order Octopoda.
See also
* octopus
* octopodes
* octopoid