reddish-brown vs red-brown

reddish-brown and red-brown both are adjectives.

Word	Noun	Adjective	Verb	Adverb
reddish-brown	No	Yes	No	No
red-brown	No	Yes	No	No

As adjectives, reddish-brown and red-brown are synonyms defined as:

Other synonyms of reddish-brown include mahogany-red.

reddish-brown (adjective)	red-brown (adjective)
of brown tinged with red	of brown tinged with red