carbonous vs carbon

carbonous is not a noun while carbon is a noun.

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

carbonous (noun)	carbon (noun)
	a copy made with carbon paper
	an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
	a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper

carbonous (adjective)	carbon (adjective)
relating to or consisting of or yielding carbon