scorpion fish vs sea scorpion

scorpion fish and sea scorpion both are nouns.

Word	Noun	Adjective	Verb	Adverb
scorpion fish	Yes	No	No	No
sea scorpion	Yes	No	No	No

As nouns, scorpion fish and sea scorpion are synonyms defined as:

scorpion fish and sea scorpion: marine fishes having a tapering body with an armored head and venomous spines

Other synonyms of scorpion fish include scorpionfish.

scorpion fish (noun)	sea scorpion (noun)
marine fishes having a tapering body with an armored head and venomous spines	marine fishes having a tapering body with an armored head and venomous spines