devilfish vs octopod

devilfish and octopod both are nouns.

Word	Noun	Adjective	Verb	Adverb
devilfish	Yes	No	No	No
octopod	Yes	No	No	No

As nouns, octopod is a hypernym of devilfish; that is, octopod is a word with a broader meaning than devilfish:

devilfish: bottom-living cephalopod having a soft oval body with eight long tentacles
octopod: a cephalopod with eight arms but lacking an internal shell

devilfish (noun)	octopod (noun)
extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned	a cephalopod with eight arms but lacking an internal shell
bottom-living cephalopod having a soft oval body with eight long tentacles
medium-sized greyish-black whale of the northern Pacific