hedgehog vs rodent

hedgehog and rodent both are nouns.

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

As nouns, rodent is a hypernym of hedgehog; that is, rodent is a word with a broader meaning than hedgehog:

hedgehog: relatively large rodents with sharp erectile bristles mingled with the fur
rodent: relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

Other hypernyms of hedgehog include gnawer.

hedgehog (noun)	rodent (noun)
small nocturnal Old World mammal covered with both hair and protective spines	relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing
relatively large rodents with sharp erectile bristles mingled with the fur