bullfrog vs ranid

bullfrog and ranid both are nouns.

Word	Noun	Adjective	Verb	Adverb
bullfrog	Yes	No	No	No
ranid	Yes	No	No	No

As nouns, ranid is a hypernym of bullfrog; that is, ranid is a word with a broader meaning than bullfrog:

bullfrog: largest North American frog; highly aquatic with a deep-pitched voice
ranid: insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs

Other hypernyms of bullfrog include true frog.

bullfrog (noun)	ranid (noun)
largest North American frog; highly aquatic with a deep-pitched voice	insectivorous usually semiaquatic web-footed amphibian with smooth moist skin and long hind legs