How to Say "synthesizer" in Spanish
The Spanish word for “synthesizer” is “teclado” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
electronic musical device

Examples
Ella toca el teclado en una banda.
She plays the keyboard in a band.
El piano tiene un teclado de ochenta y ocho teclas.
The piano has a keyboard of eighty-eight keys.
Prefiero el sonido del teclado eléctrico.
I prefer the sound of the electric keyboard.
Playing an Instrument
In Spanish, we use the action word 'tocar' (which literally means 'to touch') when talking about playing the keyboard. Never use 'jugar'.
Piano vs. Teclado
Mistake: “El teclado es muy grande y de madera.”
Correction: El piano es muy grande y de madera.
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