olive oil vs vegetable oil

olive oil and vegetable oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
olive oil	Yes	No	No	No
vegetable oil	Yes	No	No	No

As nouns, vegetable oil is a hypernym of olive oil; that is, vegetable oil is a word with a broader meaning than olive oil:

olive oil: oil from olives
vegetable oil: any of a group of liquid edible fats that are obtained from plants

Other hypernyms of olive oil include oil.

olive oil (noun)	vegetable oil (noun)
oil from olives	any of a group of liquid edible fats that are obtained from plants