voider vs ring mail

voider and ring mail both are nouns.

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

As nouns, ring mail is a hypernym of voider; that is, ring mail is a word with a broader meaning than voider:

Other hypernyms of voider include chain armor, chain armour, chain mail, mail, ring armor, ring armour.

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