copper color vs Venetian red

copper color and Venetian red both are nouns.

Word	Noun	Adjective	Verb	Adverb
copper color	Yes	No	No	No
Venetian red	Yes	No	No	No

As nouns, Venetian red is a hypernym of copper color; that is, Venetian red is a word with a broader meaning than copper color:

Other hypernyms of copper color include burnt sienna, mahogany, reddish brown, sepia.

copper color (noun)	Venetian red (noun)
a reddish-brown color resembling the color of polished copper	a shade of brown with a tinge of red