tawny owl vs Strix aluco

tawny owl and Strix aluco both are nouns.

Word	Noun	Adjective	Verb	Adverb
tawny owl	Yes	No	No	No
Strix aluco	Yes	No	No	No

As nouns, tawny owl and Strix aluco are synonyms defined as:

tawny owl and Strix aluco: reddish-brown European owl having a round head with black eyes

tawny owl (noun)	Strix aluco (noun)
reddish-brown European owl having a round head with black eyes	reddish-brown European owl having a round head with black eyes