Ravioli vs. Pierogi: What's the Difference?

Ravioli and Pierogi Definitions
Ravioli
A small casing of pasta with any of various fillings, such as chopped meat or cheese.
Pierogi
A semicircular dumpling with any of various fillings, such as finely chopped meat or vegetables, that is often sautéed after being boiled.
Ravioli
A dish made with ravioli.
Pierogi
(North America) A square- or crescent-shaped dumpling of unleavened dough, stuffed with sauerkraut, cheese, mashed potatoes, cabbage, onion, meat, or any combination of these, or with a fruit filling.
Ravioli
Plural of raviolo
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Ravioli
Small square parcels of pasta filled with meat, cheese, spinach etc.
Ravioli
A dish made with ravioli.
Ravioli
(informal) by analogy, similar dishes/pastas from non-Italian cuisines.
Ravioli
Small circular or square cases of dough with savory fillings