bluehead vs Thalassoma bifasciatum

bluehead and Thalassoma bifasciatum both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluehead	Yes	No	No	No
Thalassoma bifasciatum	Yes	No	No	No

As nouns, bluehead and Thalassoma bifasciatum are synonyms defined as:

bluehead and Thalassoma bifasciatum: small Atlantic wrasse the male of which has a brilliant blue head

bluehead (noun)	Thalassoma bifasciatum (noun)
small Atlantic wrasse the male of which has a brilliant blue head	small Atlantic wrasse the male of which has a brilliant blue head