oil vs copra oil

oil and copra oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil	Yes	No	Yes	No
copra oil	Yes	No	No	No

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

oil (noun)	copra oil (noun)
oil paint containing pigment that is used by an artist	oil from coconuts
any of a group of liquid edible fats that are obtained from plants
a slippery or viscous liquid or liquefiable substance not miscible with water
a dark oil consisting mainly of hydrocarbons

oil (verb)	copra oil (verb)
administer an oil or ointment to; often in a religious ceremony of blessing
cover with oil, as if by rubbing