mahogany vs burnt sienna

mahogany and burnt sienna both are nouns.

Word	Noun	Adjective	Verb	Adverb
mahogany	Yes	No	No	No
burnt sienna	Yes	No	No	No

As nouns, mahogany and burnt sienna are synonyms defined as:

Other synonyms of mahogany include reddish brown, sepia, Venetian red.

mahogany (noun)	burnt sienna (noun)
a shade of brown with a tinge of red	a shade of brown with a tinge of red
any of various tropical timber trees of the family Meliaceae especially the genus Swietinia valued for their hard yellowish- to reddish-brown wood that is readily worked and takes a high polish	a reddish-brown pigment produced by roasting sienna
wood of any of various mahogany trees; much used for cabinetwork and furniture