tiger cat vs Felis tigrina

tiger cat and Felis tigrina both are nouns.

Word	Noun	Adjective	Verb	Adverb
tiger cat	Yes	No	No	No
Felis tigrina	Yes	No	No	No

As nouns, tiger cat and Felis tigrina are synonyms defined as:

tiger cat and Felis tigrina: medium-sized wildcat of Central America and South America having a dark-striped coat

tiger cat (noun)	Felis tigrina (noun)
medium-sized wildcat of Central America and South America having a dark-striped coat	medium-sized wildcat of Central America and South America having a dark-striped coat
a cat having a striped coat