expert committee; technical committee
A committee formed to discuss or investigate specialized or technical matters, often within an organization or government body.
An expert committee was set up to address environmental issues.
The technical committee's report is scheduled to be released next month.
委員会 is a general committee, while 専門部会 specifically implies a committee of experts or specialists.
Compound of 専門 (specialty, expert) and 部会 (sectional meeting, committee).