lion vs king of beasts

lion and king of beasts both are nouns.

Word	Noun	Adjective	Verb	Adverb
lion	Yes	No	No	No
king of beasts	Yes	No	No	No

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

lion 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 lion include Panthera leo.

lion (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
a celebrity who is lionized (much sought after)