heath pea vs earth-nut pea

heath pea and earth-nut pea both are nouns.

Word	Noun	Adjective	Verb	Adverb
heath pea	Yes	No	No	No
earth-nut pea	Yes	No	No	No

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

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

Other synonyms of heath pea include earthnut pea, Lathyrus tuberosus, tuberous vetch.

heath pea (noun)	earth-nut pea (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