分野|ぶんやbun'ya[1]atamadaka (head-high)

1. nounfield; sphere; realm; division; branch
   彼かれはこの分野ぶんやでは草分くさわけだ。↗

   He is a trailblazer in this field.

• Synonym領域りょういきWrittenCovers the scope a discipline or activity reaches, and also territory, as in 「専門領域」; stresses boundaries more than 「分野」 and is written/formal prose.
• SynonymフィールドNeutralLoanword for a research field, or the outdoors or a sports field, as in 「フィールドワーク」; has a lighter feel than 「分野」.
• Synonym部門ぶもんNeutralA category-based part of an organization or competition, as in 「営業部門」「新人部門」; leans organizational, while 「分野」 suits scholarship and business.
• Synonym方面ほうめんNeutralA direction and its surroundings, or a field with its related scope, as in 「医療方面」; looser and vaguer than 「分野」.
• Synonym科かNeutralA university or hospital department, or a biological family, as in 「内科」「英文科」; an institutional or taxonomic unit.
• Synonym領分りょうぶんWrittenThe range of one's power or responsibility, as in 「他人の領分を侵す」; carries a turf nuance and is written/formal prose.
• Synonym部ぶNeutralA department in an organization or a school club, as in 「営業部」「野球部」; an organizational unit, not a field of study.
• Related範囲はんいNeutralA set extent or limit, as in 「試験範囲」; not restricted to academic fields.
• Related世界せかいNeutralAn industry or circle, as in 「芸能の世界」; carries a social-circle nuance, while 「分野」 refers to scholarly or business categories.
• Related部ぶNeutralA department in an organization or a school club, as in 「営業部」「野球部」; an organizational unit, not a field of study.
• RelatedエリアNeutralLoanword for a geographic area or zone, as in 「サービスエリア」; mostly spatial, not a field of study.
• RelatedセクションNeutralLoanword for an office within an organization or a chapter of a document; leans toward organizational, structural divisions.

Use 「分野」 for fields of learning or business. Stress boundaries with 「領域」, rough aspects with 「方面」, organizational divisions with 「部門」, industry circles with 「世界」. 「範囲」 is extent or limits; 「部」「科」「セクション」 are organizational units; 「エリア」 is spatial; 「フィールド」 is a lighter loanword; 「領分」 is one's turf.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 学問がくもんや芸術げいじゅつ、職業しょくぎょう、技術ぎじゅつ、身体しんたい活動かつどうなどにおける各かく領域りょういき。ジャンル、フィールド。