aniseed oil vs anise oil

aniseed oil and anise oil both are nouns.

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

As nouns, aniseed oil and anise oil are synonyms defined as:

aniseed oil and anise oil: an essential oil extracted from the seeds of Pimpinella anisum (aniseed), having a pungent liquorice-like smell.

Other synonyms of aniseed oil include oil of anise.

aniseed oil (noun)	anise oil (noun)
an essential oil extracted from the seeds of Pimpinella anisum (aniseed), having a pungent liquorice-like smell.	an essential oil extracted from the seeds of Pimpinella anisum (aniseed), having a pungent liquorice-like smell.