burnt sienna vs Venetian red

burnt sienna and Venetian red both are nouns.

Word	Noun	Adjective	Verb	Adverb
burnt sienna	Yes	No	No	No
Venetian red	Yes	No	No	No

As nouns, burnt sienna and Venetian red are synonyms defined as:

Other synonyms of burnt sienna include mahogany, reddish brown, sepia.

burnt sienna (noun)	Venetian red (noun)
a shade of brown with a tinge of red	a shade of brown with a tinge of red
a reddish-brown pigment produced by roasting sienna