How to Say "spare" in Spanish
The most common Spanish word for “spare” is “extra” — use 'extra' when referring to something that is additional or more than what is strictly necessary, often implying abundance..
extra
ESS-trah/ˈeks.tɾa/

Examples
Necesitamos comprar comida extra para la fiesta.
We need to buy extra food for the party.
Trabajé dos horas extra hoy.
I worked two extra hours today.
Tengo una batería extra en mi mochila.
I have a spare battery in my backpack.
Adjective Placement
Unlike many adjectives, 'extra' almost always goes after the noun it describes: 'tiempo extra' (extra time), not 'extra tiempo'.
Changing the Form
Mistake: “Compramos comidas extras.”
Correction: Compramos comida extra. 'Extra' usually stays the same regardless of whether the noun is singular or plural, masculine or feminine.
libres
/lí-bres//ˈli.βɾes/

Examples
¿Tienen habitaciones libres en este hotel?
Do you have any available rooms in this hotel?
Normalmente, mis fines de semana son libres.
Normally, my weekends are free (I don't have work).
Los asientos del fondo siempre están libres.
The back seats are always spare/empty.
Using 'Estar'
When talking about availability (whether a table, room, or person is currently not busy), you almost always use the verb 'estar' (están libres).
reemplazo
/reh-em-PLAH-soh//re.emˈpla.so/

Examples
Necesitamos un reemplazo para la bombilla de la cocina.
We need a replacement for the kitchen light bulb.
Ella es el reemplazo temporal de nuestro profesor.
She is our teacher's temporary substitute.
El reemplazo de la pieza vieja mejoró el rendimiento del coche.
The replacement of the old part improved the car's performance.
Noun Gender
Even when referring to a woman who is a substitute, the word remains masculine: 'el reemplazo'.
Using 'de'
To say what is being replaced, always follow the word with 'de' (e.g., 'el reemplazo de la batería').
Wrong Gender
Mistake: “La reemplazo”
Correction: El reemplazo. Even though it ends in 'o' and might refer to a woman, it's always a masculine noun.
Choosing between 'extra' and 'reemplazo'
Related Translations
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