porcupine fish vs spiny puffer

porcupine fish and spiny puffer both are nouns.

Word	Noun	Adjective	Verb	Adverb
porcupine fish	Yes	No	No	No
spiny puffer	Yes	No	No	No

As nouns, spiny puffer is a hypernym of porcupine fish; that is, spiny puffer is a word with a broader meaning than porcupine fish:

porcupine fish: spines become erect when the body is inflated; worldwide in warm waters
spiny puffer: puffers having rigid or erectile spines

porcupine fish (noun)	spiny puffer (noun)
spines become erect when the body is inflated; worldwide in warm waters	puffers having rigid or erectile spines