outer garment vs coat

outer garment and coat both are nouns.

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

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

outer garment: a garment worn over other garments
coat: an outer garment that has sleeves and covers the body from shoulder down; worn outdoors

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

outer garment (noun)	coat (noun)
a garment worn over other garments	growth of hair or wool or fur covering the body of an animal
	an outer garment that has sleeves and covers the body from shoulder down; worn outdoors
	a thin layer covering something

outer garment (verb)	coat (verb)
	cover or provide with a coat
	put a coat on; cover the surface of; furnish with a surface
	form a coat over