sheepskin coat vs coat

sheepskin coat and coat both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheepskin coat	Yes	No	No	No
coat	Yes	No	Yes	No

As nouns, coat is a hypernym of sheepskin coat; that is, coat is a word with a broader meaning than sheepskin coat:

sheepskin coat: a coat made of sheepskin
coat: an outer garment that has sleeves and covers the body from shoulder down; worn outdoors

sheepskin coat (noun)	coat (noun)
a coat made of sheepskin	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

sheepskin coat (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