field pea vs Austrian winter pea

field pea and Austrian winter pea both are nouns.

Word	Noun	Adjective	Verb	Adverb
field pea	Yes	No	No	No
Austrian winter pea	Yes	No	No	No

As nouns, field pea and Austrian winter pea are synonyms defined as:

field pea and Austrian winter pea: variety of pea plant native to the Mediterranean region and North Africa and widely grown especially for forage

Other synonyms of field pea include field-pea plant, Pisum arvense, Pisum sativum arvense.

field pea (noun)	Austrian winter pea (noun)
coarse small-seeded pea often used as food when young and tender	variety of pea plant native to the Mediterranean region and North Africa and widely grown especially for forage
variety of pea plant native to the Mediterranean region and North Africa and widely grown especially for forage
seed of the field pea plant