porcupinefish vs spiny puffer

porcupinefish and spiny puffer both are nouns.

Word	Noun	Adjective	Verb	Adverb
porcupinefish	Yes	No	No	No
spiny puffer	Yes	No	No	No

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

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

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