piano
In both English and French, 'piano' refers to the large musical instrument with a row of black and white keys. It is used in the same context in both languages, and can refer to the act of playing, or the instrument itself. For instance, 'I play the piano' translates in French as 'Je joue du piano'.
I like playing the piano.
In this sentence, 'jouer du piano' means 'to play the piano'. In French, the preposition 'du' is often used with musical instruments.
The piano is a musical instrument.
This sentence is a basic, straightforward sentence stating a fact. 'Instrument musical' translates directly to 'musical instrument'.
The sound of the piano is magnificent.
In this sentence, 'le son du piano' means 'the sound of the piano'. 'Magnifique' is an adjective that means 'magnificent' in English.