field-pea plant vs Pisum arvense

field-pea plant and Pisum arvense both are nouns.

Word	Noun	Adjective	Verb	Adverb
field-pea plant	Yes	No	No	No
Pisum arvense	Yes	No	No	No

As nouns, field-pea plant and Pisum arvense are synonyms defined as:

field-pea plant and Pisum arvense: variety of pea plant native to the Mediterranean region and North Africa and widely grown especially for forage

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

field-pea plant (noun)	Pisum arvense (noun)
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