(せんもん)

せんもん
noun
specialty; major; expertise
1. specialty, specialization, expertise
An area of specialized knowledge or skill.
My major/specialty is economics.
That's not my specialty.
You should see a specialist doctor.
Modifier usage
彼女(かのじょ)日本史(にほんし)専門(せんもん)している
She specializes in Japanese history.
〜を専門(せんもん)にする pattern
2. major (academic)
One's field of study at university.
My major/specialty is economics.
What is your major at university?
I'm wondering whether to change my major.

専門(せんもん) is primarily a noun meaning 'specialty' or 'major.'

Common patterns:

  • 専門(せんもん)する: to specialize in ~
  • 専門(せんもん)です: My specialty/major is ~
  • 専門(せんもん) + noun: specialized/specialist + noun

Related words:

Note: While 専門(せんもん) can modify nouns directly (専門(せんもん)の〜), for adjectival use meaning 'specialized' or 'technical,' 専門的(せんもんてき) (na-adjective) is more common.