use

1. Origins, structure, and basic meaning

• Structure: 用 has 5 strokes and concerns use, purpose, or something to attend to.
• Basic usage: 用事 is read ようじ, and 汎用 is read はんよう.

2. Common pitfalls and similar expressions

• An errand and a range of uses
  • 用事が済んだら means once the errand is finished. 用事 is something to attend to.
  • 汎用の充電器 is a general-purpose charger usable with several devices. 汎用 indicates broad use, without guaranteeing compatibility with every device.