research area; field of research
A broad term for an academic or scientific domain of study. Used in formal and professional contexts.
His field of research is molecular biology.
This university has diverse research areas.
専門分野 emphasizes one's specialization or expertise, while 研究分野 is specifically about research domains.
学問分野 is a more academic term for a discipline or branch of learning, often used in educational contexts.
Compound of 研究 (research) and 分野 (field, area). The components are standard Sino-Japanese words.