peanut oil vs vegetable oil

peanut oil and vegetable oil both are nouns.

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

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

peanut oil: an oil from peanuts; used in cooking and making soap
vegetable oil: any of a group of liquid edible fats that are obtained from plants

Other hypernyms of peanut oil include oil.

peanut oil (noun)	vegetable oil (noun)
an oil from peanuts; used in cooking and making soap	any of a group of liquid edible fats that are obtained from plants