armor-bearer vs armiger

armor-bearer and armiger both are nouns.

Word	Noun	Adjective	Verb	Adverb
armor-bearer	Yes	No	No	No
armiger	Yes	No	No	No

As nouns, armor-bearer and armiger are synonyms defined as:

armor-bearer (noun)	armiger (noun)
a squire carrying the armor of a knight	a squire carrying the armor of a knight
	a nobleman entitled to bear heraldic arms