Psettichthys melanostichus vs sand sole

Psettichthys melanostichus and sand sole both are nouns.

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

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

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

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