nobleman vs noble

nobleman and noble both are nouns.

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

As nouns, nobleman and noble are synonyms defined as:

Other synonyms of nobleman include Lord.

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

nobleman (adjective)	noble (adjective)
	having or showing or indicative of high or elevated character
	of or belonging to or constituting the hereditary aristocracy especially as derived from feudal times
	impressive in size, manner, or appearance
	inert especially toward oxygen