aniseed oil vs volatile oil

aniseed oil and volatile oil both are nouns.

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

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

aniseed oil: an essential oil extracted from the seeds of Pimpinella anisum (aniseed), having a pungent liquorice-like smell.
volatile oil: an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings

Other hypernyms of aniseed oil include essential oil.

aniseed oil (noun)	volatile oil (noun)
an essential oil extracted from the seeds of Pimpinella anisum (aniseed), having a pungent liquorice-like smell.	an oil having the odor or flavor of the plant from which it comes; used in perfume and flavorings