Hola Hans

Yes, in many contexts, "bolígrafo" and "pluma" can be used interchangeably to refer to a writing instrument. However, it's important to mention that traditionally, "pluma" refers to a 'fountain pen', which is a type of pen that uses liquid ink and has a fine metal tip. On the other hand, "bolígrafo" more commonly refers to a writing instrument with a ball tip that dispenses ink, known in English as a 'ballpoint pen'.

In everyday practice, especially in informal conversations, many people use both terms to talk about any kind of writing instrument, but technically they can refer to different types of pens.

Feliz semana

Silvia