core , ***
nucleus *
core group

In late 1998, a core group of 15 people had their first meeting.

At first, only a small core group take the challenge.

In each case, the Government has picked the core group.

The core group that studies with her today discovered the class in various ways.

"They may end up the core group," said one person familiar with the board and its members.

He's called an emergency meeting of the core group for early this evening.

However there was a core group who carried out most of the debate between themselves.

Many have been practicing for the last two years with the same core group of five or six women.

Although they never reached ten, their core group was just as solid.

We used to have a core group of the top 25 players.