porcupine fish vs Diodon hystrix

porcupine fish and Diodon hystrix both are nouns.

Word	Noun	Adjective	Verb	Adverb
porcupine fish	Yes	No	No	No
Diodon hystrix	Yes	No	No	No

As nouns, porcupine fish and Diodon hystrix are synonyms defined as:

porcupine fish and Diodon hystrix: spines become erect when the body is inflated; worldwide in warm waters

Other synonyms of porcupine fish include porcupinefish.

porcupine fish (noun)	Diodon hystrix (noun)
spines become erect when the body is inflated; worldwide in warm waters	spines become erect when the body is inflated; worldwide in warm waters