Fountain pen and Stylus

Fountain pen noun - A pen that is supplied with ink from a reservoir in its barrel.

Stylus and fountain pen are semantically related. In some cases you can use "Stylus" instead a noun phrase "Fountain pen".

Stylus noun - A pointed tool for writing or drawing or engraving.

Fountain pen and stylus are semantically related. You can use "Fountain pen" instead a noun "Stylus".