outer garment vs cloak

outer garment and cloak both are nouns.

Word	Noun	Adjective	Verb	Adverb
outer garment	Yes	No	No	No
cloak	Yes	No	Yes	No

As nouns, cloak is a hyponym of outer garment; that is, cloak is a word with a more specific, narrower meaning than outer garment:

Other hyponyms of outer garment include aba, coat, frock, izar, snowsuit.

outer garment (noun)	cloak (noun)
a garment worn over other garments	a loose outer garment
	anything that covers or conceals

outer garment (verb)	cloak (verb)
	cover with or as if with a cloak
	cover as if with clothing
	hide under a false appearance