earth-nut pea vs tuberous vetch

earth-nut pea and tuberous vetch both are nouns.

Word	Noun	Adjective	Verb	Adverb
earth-nut pea	Yes	No	No	No
tuberous vetch	Yes	No	No	No

As nouns, earth-nut pea and tuberous vetch are synonyms defined as:

earth-nut pea and tuberous vetch: European herb bearing small tubers used for food and in Scotland to flavor whiskey

Other synonyms of earth-nut pea include earthnut pea, heath pea, Lathyrus tuberosus.

earth-nut pea (noun)	tuberous vetch (noun)
European herb bearing small tubers used for food and in Scotland to flavor whiskey	European herb bearing small tubers used for food and in Scotland to flavor whiskey