wardrobe vs armoire

wardrobe and armoire both are nouns.

Word	Noun	Adjective	Verb	Adverb
wardrobe	Yes	No	No	No
armoire	Yes	No	No	No

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

wardrobe: a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
armoire: a large wardrobe or cabinet; originally used for storing weapons

Other hyponyms of wardrobe include clothes closet, clothespress, coat closet.

wardrobe (noun)	armoire (noun)
a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes	a large wardrobe or cabinet; originally used for storing weapons
collection of clothing belonging to one person
collection of costumes belonging to a theatrical company