Shower (bathroom facility) – la ducha
(Pronounced doo-chah)
To remember that shower is pronounced doo-chah (ducha) in Spanish, use the following mnemonic:
In the Cuban hotel room, there was a notice on the shower saying: "Please don't do the cha cha (ducha) in here". But some guests took no notice...

Ducha is feminine, so it's la ducha. Imagine ladies dressing up as showers:

Examples of ducha (shower) in a sentence
Me gusta tomar una ducha fría por la mañana.
(I like to take a cold shower in the morning.)
El agua de la ducha no está caliente.
(The water from the shower is not hot.)
Necesito arreglar la ducha porque está rota.
(I need to fix the shower because it is broken.)