Panthera tigris vs tiger

Panthera tigris and tiger both are nouns.

Word	Noun	Adjective	Verb	Adverb
Panthera tigris	Yes	No	No	No
tiger	Yes	No	No	No

As nouns, Panthera tigris and tiger are synonyms defined as:

Panthera tigris and tiger: large feline of forests in most of Asia having a tawny coat with black stripes; endangered

Panthera tigris (noun)	tiger (noun)
large feline of forests in most of Asia having a tawny coat with black stripes; endangered	large feline of forests in most of Asia having a tawny coat with black stripes; endangered
	a fierce or audacious person