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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 delgadas.I'm going to cut the mushrooms into thin slices.
la cebolla()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (vegetable)