subcommittee
noun [ C ] uk/ˈsʌb.kəˌmɪt.i/ us/ˈsʌb.kəˌmɪt.i/
（委员会下设的）小组委员会，专门小组
a number of people chosen from a committee (= a small group of people who represent a larger organization and make decisions for it) to study and report on a particular subject
Several subcommittees will be set up to deal with specific environmental issues. 将专门成立几个小组委员会，来处理具体的环境问题。