Rana catesbeiana vs bullfrog

Rana catesbeiana and bullfrog both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rana catesbeiana	Yes	No	No	No
bullfrog	Yes	No	No	No

As nouns, Rana catesbeiana and bullfrog are synonyms defined as:

Rana catesbeiana and bullfrog: largest North American frog; highly aquatic with a deep-pitched voice

Rana catesbeiana (noun)	bullfrog (noun)
largest North American frog; highly aquatic with a deep-pitched voice	largest North American frog; highly aquatic with a deep-pitched voice