Sium sisarum vs skirret

Sium sisarum and skirret both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sium sisarum	Yes	No	No	No
skirret	Yes	No	No	No

As nouns, Sium sisarum and skirret are synonyms defined as:

Sium sisarum and skirret: an Asiatic herb cultivated in Europe for its sweet edible tuberous root

Sium sisarum (noun)	skirret (noun)
an Asiatic herb cultivated in Europe for its sweet edible tuberous root	an Asiatic herb cultivated in Europe for its sweet edible tuberous root