king of beasts vs Panthera leo

king of beasts and Panthera leo both are nouns.

Word	Noun	Adjective	Verb	Adverb
king of beasts	Yes	No	No	No
Panthera leo	Yes	No	No	No

As nouns, king of beasts and Panthera leo are synonyms defined as:

king of beasts and Panthera leo: large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male

Other synonyms of king of beasts include lion.

king of beasts (noun)	Panthera leo (noun)
large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male	large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male