vegetable oil vs edible fat

vegetable oil and edible fat both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable oil	Yes	No	No	No
edible fat	Yes	No	No	No

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

vegetable oil: any of a group of liquid edible fats that are obtained from plants
edible fat: oily or greasy matter making up the bulk of fatty tissue in animals and in seeds and other plant tissue

vegetable oil (noun)	edible fat (noun)
any of a group of liquid edible fats that are obtained from plants	oily or greasy matter making up the bulk of fatty tissue in animals and in seeds and other plant tissue