As nouns,
lefteyed flounder is a hypernym of
Scophthalmus rhombus; that is, lefteyed flounder is a
word with a broader meaning than Scophthalmus rhombus:
Scophthalmus rhombus: European food fish
lefteyed flounder: flatfishes with both eyes on the left side of the head
Other hypernyms of Scophthalmus rhombus include
lefteye flounder.