Assuming you are asking about the verb “to eat”, the correct word in Spanish is “comer”. However, there are a few other words that can also be used such as “consumir” or “ingerir”.
The word “comer” is used for all types of eating, whether it be at a meal or just snacking. It is also used when referring to food in general, such as in the phrase “me gusta comer pizza” (I like to eat pizza).
The word “consumir” is generally used when referring to eating food that will provide sustenance or energy, such as in the phrase “necesito consumir más proteínas” (I need to consume more protein). It can also be used when talking about someone who eats a lot, such as in the phrase “es un gran consumidor de carne (he's a big meat eater).
The word ingerir is typically used when talking about consuming liquids, such as water or juice. It can also be used when referring to taking medicine or drugs. For example, you might say estoy ingiriendo antibióticos para la gripe (I'm taking antibiotics for the flu).