In use, the main difference would be cooking time. Lentils, dried peas and chickpeas are all legumes, a cousin of the bean.
All legumes are seeds that grow within pods.
Lentils do not require any presoak and cook in 15-20 mins. Dried Peas are most commonly split which allows them to cook in 30 mins without a presoak. Americans are most familiar with green peas, but yellow peas are also grown. They are most commonly consumed in Scandinavia and taste slightly different than green peas. Alert us of bad posts.