noble vs armiger

noble and armiger both are nouns.

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

As nouns, armiger is a hyponym of noble; that is, armiger is a word with a more specific, narrower meaning than noble:

noble (noun)	armiger (noun)
a titled peer of the realm	a squire carrying the armor of a knight
	a nobleman entitled to bear heraldic arms

noble (adjective)	armiger (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