ring armour vs voider

ring armour and voider both are nouns.

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

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

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

ring armour (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