carboniferous vs carbonous

carboniferous and carbonous both are adjectives.

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

As adjectives, carboniferous and carbonous are synonyms defined as:

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

Other synonyms of carboniferous include carbonaceous, carbonic.

carboniferous (adjective)	carbonous (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