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

Examples
Necesito aprender más vocabulario para hablar mejor.
I need to learn more vocabulary to speak better.
Ella tiene un vocabulario muy amplio porque lee mucho.
She has a very wide vocabulary because she reads a lot.
El vocabulario técnico de esta profesión es bastante complicado.
The technical vocabulary of this profession is quite complicated.
Always Singular for a Person's Knowledge
Even though you know thousands of words, you refer to them as 'el vocabulario' (singular). We only use the plural 'vocabularios' when comparing different sets of words, like the word lists from two different books.
The 'V' Sound
In Spanish, the 'v' is pronounced exactly like a 'b'. Think of it as 'bo-ka-bu-la-ryo' with a soft 'b' sound at the start.
Vocabulario vs. Palabra
Mistake: “Tengo que aprender muchos vocabularios nuevos.”
Correction: Tengo que aprender muchas palabras nuevas (or 'nuevo vocabulario'). Use 'palabras' for individual words and 'vocabulario' for the whole group.
Related Translations
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