Panthera leo vs king of beasts

Panthera leo and king of beasts both are nouns.

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

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

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

Other synonyms of Panthera leo include lion.

Panthera leo (noun)	king of beasts (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