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"Champiñón" is a noun which is often translated as "mushroom", and "cebolla" is a noun which is often translated as "onion". Learn more about the difference between "champiñón" and "cebolla" below.
el champiñón()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (culinary)
a. mushroom
Voy a cortar los champiñones en rebanadas finas.I'm going to slice the mushrooms thinly.
la cebolla()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (vegetable)
a. onion
El cocinero siempre pone cebolla picada en sus tacos.The cook always puts chopped onion in his tacos.
