field-pea plant vs Pisum sativum arvense

field-pea plant and Pisum sativum arvense both are nouns.

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

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

field-pea plant and Pisum sativum 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 arvense.

field-pea plant (noun)	Pisum sativum 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