carboniferous vs carbonaceous

carboniferous and carbonaceous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
carboniferous	No	Yes	No	No
carbonaceous	No	Yes	No	No

As adjectives, carboniferous and carbonaceous are synonyms defined as:

carboniferous and carbonaceous: relating to or consisting of or yielding carbon

Other synonyms of carboniferous include carbonic, carbonous.

carboniferous (adjective)	carbonaceous (adjective)
relating to or consisting of or yielding carbon	relating to or consisting of or yielding carbon
of or relating to the Carboniferous geologic era