carbonic vs carboniferous

carbonic and carboniferous both are adjectives.

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

As adjectives, carbonic and carboniferous are synonyms defined as:

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

Other synonyms of carbonic include carbonaceous, carbonous.

carbonic (adjective)	carboniferous (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