noun
pea; garden pea
Refers to the plant Pisum sativum and its edible seeds. Often used in compounds like エンドウ豆.
エンドウの苗を庭に植えた。
I planted pea seedlings in the garden.
サラダにエンドウを加える。
Add peas to the salad.
グリーンピース specifically refers to green peas as a food, while エンドウ is the broader term for the pea plant and its seeds.
The Japanese word エンドウ likely derives from the Chinese reading of 豌豆 (wāndòu), adapted into Japanese as えんどう.