sand sole vs Psettichthys melanostichus

sand sole and Psettichthys melanostichus both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand sole	Yes	No	No	No
Psettichthys melanostichus	Yes	No	No	No

As nouns, sand sole and Psettichthys melanostichus are synonyms defined as:

sand sole and Psettichthys melanostichus: a common flatfish of the Pacific coast of North America

sand sole (noun)	Psettichthys melanostichus (noun)
a common flatfish of the Pacific coast of North America	a common flatfish of the Pacific coast of North America