flame-orange vs red-orange

flame-orange and red-orange both are adjectives.

Word	Noun	Adjective	Verb	Adverb
flame-orange	No	Yes	No	No
red-orange	No	Yes	No	No

As adjectives, flame-orange and red-orange are synonyms defined as:

Other synonyms of flame-orange include reddish-orange.

flame-orange (adjective)	red-orange (adjective)
of orange tinged with red	of orange tinged with red