ring mail vs voider

ring mail and voider both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring mail	Yes	No	No	No
voider	Yes	No	No	No

As nouns, voider is a hyponym of ring mail; that is, voider is a word with a more specific, narrower meaning than ring mail:

Other hyponyms of ring mail include brigandine, habergeon, byrnie, hauberk, gusset.

ring mail (noun)	voider (noun)
(Middle Ages) flexible armor made of interlinked metal rings	a hamper that holds dirty clothes to be washed or wet clothes to be dried
	a piece of chain mail covering a place unprotected by armor plate
	an official who can invalidate or nullify
	a person who defecates