essential oil vs volatile oil

essential oil and volatile oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
essential oil	Yes	No	No	No
volatile oil	Yes	No	No	No

As nouns, essential oil and volatile oil are synonyms defined as:

essential oil and volatile oil: an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings

essential oil (noun)	volatile oil (noun)
an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings	an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings