hedgehog vs porcupine

hedgehog and porcupine both are nouns.

Word	Noun	Adjective	Verb	Adverb
hedgehog	Yes	No	No	No
porcupine	Yes	No	No	No

As nouns, hedgehog and porcupine are synonyms defined as:

hedgehog and porcupine: relatively large rodents with sharp erectile bristles mingled with the fur

hedgehog (noun)	porcupine (noun)
small nocturnal Old World mammal covered with both hair and protective spines	relatively large rodents with sharp erectile bristles mingled with the fur
relatively large rodents with sharp erectile bristles mingled with the fur