IPA: /ˈbɔːl.pɔɪnt/
KK: /ˈbɔlˌpɔɪnt/
A type of pen that uses a small ball at the tip to draw ink from a cartridge onto paper.
I prefer to use a ballpoint for writing notes because it doesn't smudge.
Ballpoint → The word is formed from "ball" (from Middle English *bal*, meaning a spherical object) and "point" (from Old French *point*, meaning a sharp end or tip). The term "ballpoint" refers to a writing instrument that uses a small ball as the point of ink delivery.
Think of a small 'ball' at the 'point' of the pen that delivers ink — that's how a ballpoint pen works.
No commonly confused words.