windowpane vs lefteye flounder

windowpane and lefteye flounder both are nouns.

Word	Noun	Adjective	Verb	Adverb
windowpane	Yes	No	No	No
lefteye flounder	Yes	No	No	No

As nouns, lefteye flounder is a hypernym of windowpane; that is, lefteye flounder is a word with a broader meaning than windowpane:

windowpane: very thin translucent flounder of the Atlantic coast of North America
lefteye flounder: flatfishes with both eyes on the left side of the head

Other hypernyms of windowpane include lefteyed flounder.

windowpane (noun)	lefteye flounder (noun)
very thin translucent flounder of the Atlantic coast of North America	flatfishes with both eyes on the left side of the head
a pane of glass in a window