devilfish vs grey whale

devilfish and grey whale both are nouns.

Word	Noun	Adjective	Verb	Adverb
devilfish	Yes	No	No	No
grey whale	Yes	No	No	No

As nouns, devilfish and grey whale are synonyms defined as:

devilfish and grey whale: medium-sized greyish-black whale of the northern Pacific

Other synonyms of devilfish include Eschrichtius gibbosus, Eschrichtius robustus, gray whale.

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