noble vs ignoble

noble is a noun but ignoble is not a noun.

Word	Noun	Adjective	Verb	Adverb
noble	Yes	Yes	No	No
ignoble	No	Yes	No	No

noble (noun)	ignoble (noun)
a titled peer of the realm

noble (adjective)	ignoble (adjective)
having or showing or indicative of high or elevated character	completely lacking nobility in character or quality or purpose
of or belonging to or constituting the hereditary aristocracy especially as derived from feudal times	not of the nobility
impressive in size, manner, or appearance
inert especially toward oxygen