canker vs cankerous

canker is a noun but cankerous is not a noun.

Word	Noun	Adjective	Verb	Adverb
canker	Yes	No	Yes	No
cankerous	No	Yes	No	No

canker (noun)	cankerous (noun)
a pernicious and malign influence that is hard to get rid of
an ulceration (especially of the lips or lining of the mouth)
a fungal disease of woody plants that causes localized damage to the bark

canker (adjective)	cankerous (adjective)
	having an ulcer or canker

canker (verb)	cankerous (verb)
infect with a canker
become infected with a canker