専門

1. Origins, structure, and basic meaning

• Structure: 専門, read せんもん, means a field studied in depth or the specialized expertise associated with it.
• Basic usage: 専門に学ぶ expresses specialization in study, while 専門の技術者 identifies a technician with relevant expertise.

2. Common pitfalls and similar expressions

• A field of specialization and a specialist
  • It can name a field studied in depth or modify a person with specialized skill. In the second example, it identifies expertise in repair work.