How to Say "groundnut" in Spanish
The Spanish word for “groundnut” is “maní” — A1 level. This is a very common word in everyday Spanish.

Examples
Me encanta comer maní tostado mientras veo una película.
I love eating roasted peanuts while I watch a movie.
La mantequilla de maní es muy popular en los desayunos.
Peanut butter is very popular for breakfast.
¿Este pastel tiene maní? Soy alérgico.
Does this cake have peanuts? I'm allergic.
Making it Plural
When a word ends in a stressed 'í', you can usually make it plural by adding '-es' (maníes) or just '-s' (manís). Both are correct, though 'maníes' is considered more formal.
Which 'peanut' should I use?
Mistake: “Using 'maní' in Spain or 'cacahuete' in Argentina.”
Correction: While everyone will understand you, use 'maní' in South America/Caribbean, 'cacahuate' in Mexico, and 'cacahuete' in Spain to sound like a local.
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