windowpane vs lefteyed flounder

windowpane and lefteyed flounder both are nouns.

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

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

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

Other hypernyms of windowpane include lefteye flounder.

windowpane (noun)	lefteyed 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