bullfrog vs Rana catesbeiana

bullfrog and Rana catesbeiana both are nouns.

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

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

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

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